Hppd-inhibitor herbicide tolerance

ABSTRACT

This invention relates generally to the detection of genetic differences among soybeans. More particularly, the invention relates to soybean quantitative trait loci (QTL) for tolerance or sensitivity to HPPD-inhibitor herbicides, such as mesotrione and isoxazole herbicides, to soybean plants possessing these QTLs, which map to a novel chromosomal region, and to genetic markers that are indicative of phenotypes associated with tolerance, improved tolerance, susceptibility, or increased susceptibility. Methods and compositions for use of these markers in genotyping of soybean and selection are also disclosed, as are methods and compositions for use of these markers in selection and use of herbicides for weed control. Also disclosed are isolated polynucleotides and polypeptides relating to such tolerance or sensitivity and methods of introgres sing such tolerance into a plant by breeding or transgenically or by a combination thereof. Plant cells, plants, and seeds produced are also provided.

FIELD OF THE INVENTION

This invention relates generally to the detection of genetic differencesamong soybeans.

BACKGROUND OF THE INVENTION

Soybeans (Glycine max L. Merr.) are a major cash crop and investmentcommodity in North America and elsewhere. Soybean oil is one of the mostwidely used edible oils, and soybeans are used worldwide both in animalfeed and in human food production. Additionally, soybean utilization isexpanding to industrial, manufacturing, and pharmaceutical applications.Weed management in soybean fields is important to maximizing yields. Arecent development in soybean technology has been the development ofherbicide-tolerant soybean varieties. Glyphosate tolerant soybeans werecommercially introduced in 1996 and accounted for more than 85% percentof U.S. soybean acreage in 2007.

Some weeds are starting to show increased tolerance to glyphosate. Thisincreased tolerance decreases the effectiveness of glyphosateapplication and results in lower yields for farmers. As a result thereis a need in the art for soybean varieties that are tolerant to otherherbicide chemistry.

SUMMARY OF THE INVENTION

This invention relates generally to the detection of genetic differencesamong soybeans. More particularly, the invention relates to soybeanquantitative trait loci (QTL) for tolerance or sensitivity to mesotrioneand/or isoxazole herbicides, to soybean plants possessing these QTLs,which map to a novel chromosomal region, and to genetic markers that areindicative of phenotypes associated with mesotrione and/or isoxazoleherbicide tolerance. Methods and compositions for use of these markersin genotyping, screening, and selection of soybean are also disclosed.

A novel method is provided for determining the presence or absence insoybean germplasm of a QTL associated with tolerance or susceptibilityto HPPD-inhibitor herbicides, including mesotrione and/or isoxazoleherbicides. The trait has been found to be closely linked to a number ofmolecular markers that map to linkage group L, on chromosome 19 (Gm19).Soybean plants, seeds, tissue cultures, variants and mutants havingtolerance or susceptibility to HPPD-inhibitor herbicides, includingmesotrione and/or isoxazole herbicides, produced by the foregoingmethods are also provided.

The QTL associated with tolerance or sensitivity to mesotrione and/orisoxazole herbicides maps to soybean linkage group L. The QTL may bemapped by one or more molecular markers, including SATT495, P10649C-3,SATT182, SATT388, SATT313, SATT613, and markers closely linked thereto.Other markers of linkage group L may also be used to identify thepresence or absence of the gene, including other markers above markerSATT613. Additional relevant markers on linkage group L includeS03859-1-A, S08103-1-Q1, S08104-1-Q1, S08106-1-Q1, S08110-1-Q1,S08111-1-Q1, S08115-2-Q1, S08117-1-Q1, S08119-1-Q1, S08118-1-Q1,S08116-1-Q1, S08114-1-Q1, S08113-1-Q1, S08112-1-Q1, S08108-1-Q1,S08101-2-Q1, S08101-3-Q1, S08101-4-Q1, S08105-1-Q1, S08102-1-Q1,S08107-1-Q1, S08109-1-Q1, and S08101-1-Q1, or markers closely linkedthereto (see, e.g., Tables A and B below). Other markers of linkagegroup L may also be used to identify the presence or absence of thegene, including other markers above marker SATT613.

The information disclosed herein regarding the QTL for tolerance orsensitivity to mesotrione and/or isoxazole herbicides which maps tosoybean linkage group L is used to aid in the selection of breedingplants, lines, and populations containing tolerance or sensitivity tomesotrione and/or isoxazole herbicides for use in introgression of thistrait into elite soybean germplasm, or germplasm of proven geneticsuperiority suitable for variety release.

Also provided is a method for introgressing a soybean QTL associatedwith tolerance or sensitivity to mesotrione and/or isoxazole herbicidesinto non-tolerant soybean germplasm or less tolerant soybean germplasm.According to the method, nucleic acid markers mapping the QTL are usedto select soybean plants containing the QTL. Plants so selected have ahigh probability of expressing the trait tolerance or sensitivity tomesotrione and/or isoxazole herbicides. Plants so selected can be usedin a soybean breeding program. Through the process of introgression, theQTL associated with tolerance or sensitivity to mesotrione and/orisoxazole herbicides is introduced from plants identified usingmarker-assisted selection to other plants. According to the method,agronomically desirable plants and seeds can be produced containing theQTL associated with tolerance or sensitivity to mesotrione and/orisoxazole herbicides from germplasm containing the QTL. Sources oftolerance or sensitivity to mesotrione and/or isoxazole herbicides aredisclosed below.

Also provided herein is a method for producing a soybean plant adaptedfor conferring tolerance or sensitivity to mesotrione and/or isoxazoleherbicides. First, donor soybean plants for a parental line containingthe tolerance QTL are selected. According to the method, selection canbe accomplished via nucleic acid marker-associated selection asexplained herein. Selected plant material may represent, among others,an inbred line, a hybrid, a heterogeneous population of soybean plants,or simply an individual plant. According to techniques well known in theart of plant breeding, this donor parental line is crossed with a secondparental line. Typically, the second parental line is a high yieldingline. This cross produces a segregating plant population composed ofgenetically heterogeneous plants. Plants of the segregating plantpopulation are screened for the tolerance QTL and are subjected tofurther breeding. This further breeding may include, among othertechniques, additional crosses with other lines, hybrids, backcrossing,or self-crossing. The result is a line of soybean plants that istolerant to mesotrione and/or isoxazole herbicides, and also has otherdesirable traits, such as yield, from one or more other soybean lines.

Also provided is a method for introgressing a soybean QTL associatedwith tolerance or sensitivity to mesotrione and/or isoxazole herbicidesinto non-tolerant soybean germplasm or less tolerant soybean germplasm.According to the method, nucleic acid markers mapping the QTL are usedto select soybean plants containing the QTL. Plants so selected have ahigh probability of expressing the trait tolerance or sensitivity tomesotrione and/or isoxazole herbicides. Plants so selected can be usedin a soybean breeding program. Through the process of introgression, theQTL associated with tolerance or sensitivity to mesotrione and/orisoxazole herbicides is introduced from plants identified usingmarker-assisted selection to other plants. According to the method,agronomically desirable plants and seeds can be produced containing theQTL associated with tolerance or sensitivity to mesotrione and/orisoxazole herbicides from germplasm containing the QTL. Sources oftolerance or sensitivity to mesotrione and/or isoxazole herbicides aredisclosed below.

Soybean plants, seeds, tissue cultures, variants and mutants havingtolerance or sensitivity to mesotrione and/or isoxazole herbicidesproduced by the foregoing methods are also provided. Also providedherein are methods for controlling weeds in a crop by applying to thecrop and any weeds affecting such crop an effective amount of suchherbicide(s), either pre-emergent or post-emergent, such that the weedsare substantially controlled without substantially negatively impactingthe crop. Also provided are compositions useful in the disclosedmethods, including polynucleotide primers and probes useful fordetecting relevant markers, as well as kits containing the same.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention can be more fully understood from the following detaileddescription and the accompanying drawings and Sequence Listing, whichform a part of this application.

FIG. 1 provides examples of cultivars with vastly different mesotrioneand isoxazole herbicide tolerance or sensitivity phenotype. Shown arefield samples, with a non-tolerant variety in the center and tolerantvarieties on the left and right (normal growth).

SUMMARY OF THE SEQUENCES

SEQ ID NOs: 1-5 comprise nucleotide sequences of regions of the Soybeangenome, each capable of being used as a probe or primer, either alone orin combination, for the detection of marker locus P10649C-3 on LG-L. Incertain examples, SEQ ID NOs: 1 and 2 are used as primers while SEQ IDNOs: 3-5 are used as probes.

SEQ ID NOs: 6-9 comprise nucleotide sequences of regions of the Soybeangenome, each capable of being used as a probe or primer, either alone orin combination, for the detection of marker locus S00224-1 on LG-L. Incertain examples, SEQ ID NOs: 6 and 7 are used as primers while SEQ IDNOs: 8 and 9 are used as probes.

SEQ ID NOs: 10-13 comprise nucleotide sequences of regions of theSoybean genome, each capable of being used as a probe or primer, eitheralone or in combination, for the detection of marker locus P5467-1 onLG-N. In certain examples, SEQ ID NOs: 10 and 11 are used as primerswhile SEQ ID NOs: 12 and 13 are used as probes.

SEQ ID NOs: 14-17 comprise nucleotide sequences of regions of theSoybean genome, each capable of being used as a probe or primer, eitheralone or in combination, for the detection of marker locus S08101-1-Q1on LG-L. In certain examples, SEQ ID NOs: 14 and 15 are used as primerswhile SEQ ID NOs: 16 and 17 are used as probes.

SEQ ID NOs: 18-21 comprise nucleotide sequences of regions of theSoybean genome, each capable of being used as a probe or primer, eitheralone or in combination, for the detection of marker locus S08101-2-Q1on LG-L. In certain examples, SEQ ID NOs: 18 and 19 are used as primerswhile SEQ ID NOs: 20 and 21 are used as probes.

SEQ ID NOs: 22-25 comprise nucleotide sequences of regions of theSoybean genome, each capable of being used as a probe or primer, eitheralone or in combination, for the detection of marker locus S08101-3-Q1on LG-L. In certain examples, SEQ ID NOs: 22 and 23 are used as primerswhile SEQ ID NOs: 24 and 25 are used as probes.

SEQ ID NOs: 26-29 comprise nucleotide sequences of regions of theSoybean genome, each capable of being used as a probe or primer, eitheralone or in combination, for the detection of marker locus S08101-4-Q1on LG-L. In certain examples, SEQ ID NOs: 26 and 27 are used as primerswhile SEQ ID NOs: 28 and 29 are used as probes.

SEQ ID NOs: 30-33 comprise nucleotide sequences of regions of theSoybean genome, each capable of being used as a probe or primer, eitheralone or in combination, for the detection of marker locus S08102-1-Q1on LG-L. In certain examples, SEQ ID NOs: 30 and 31 are used as primerswhile SEQ ID NOs: 32 and 33 are used as probes.

SEQ ID NOs: 34-37 comprise nucleotide sequences of regions of theSoybean genome, each capable of being used as a probe or primer, eitheralone or in combination, for the detection of marker locus S08103-1-Q1on LG-L. In certain examples, SEQ ID NOs: 34 and 35 are used as primerswhile SEQ ID NOs: 36 and 37 are used as probes.

SEQ ID NOs: 38-41 comprise nucleotide sequences of regions of theSoybean genome, each capable of being used as a probe or primer, eitheralone or in combination, for the detection of marker locus S08104-1-Q1on LG-L. In certain examples, SEQ ID NOs: 38 and 39 are used as primerswhile SEQ ID NOs: 40 and 41 are used as probes.

SEQ ID NOs: 42-45 comprise nucleotide sequences of regions of theSoybean genome, each capable of being used as a probe or primer, eitheralone or in combination, for the detection of marker locus S08105-1-Q1on LG-L. In certain examples, SEQ ID NOs: 42 and 43 are used as primerswhile SEQ ID NOs: 44 and 45 are used as probes.

SEQ ID NOs: 46-49 comprise nucleotide sequences of regions of theSoybean genome, each capable of being used as a probe or primer, eitheralone or in combination, for the detection of marker locus S08106-1-Q1on LG-L. In certain examples, SEQ ID NOs: 46 and 47 are used as primerswhile SEQ ID NOs: 48 and 49 are used as probes.

SEQ ID NOs: 50-53 comprise nucleotide sequences of regions of theSoybean genome, each capable of being used as a probe or primer, eitheralone or in combination, for the detection of marker locus S08107-1-Q1on LG-L. In certain examples, SEQ ID NOs: 50 and 51 are used as primerswhile SEQ ID NOs: 52 and 53 are used as probes.

SEQ ID NOs: 54-57 comprise nucleotide sequences of regions of theSoybean genome, each capable of being used as a probe or primer, eitheralone or in combination, for the detection of marker locus S08108-1-Q1on LG-L. In certain examples, SEQ ID NOs: 54 and 55 are used as primerswhile SEQ ID NOs: 56 and 57 are used as probes.

SEQ ID NOs: 58-61 comprise nucleotide sequences of regions of theSoybean genome, each capable of being used as a probe or primer, eitheralone or in combination, for the detection of marker locus S08109-1-Q1on LG-L. In certain examples, SEQ ID NOs: 58 and 59 are used as primerswhile SEQ ID NOs: 60 and 61 are used as probes.

SEQ ID NOs: 62-65 comprise nucleotide sequences of regions of theSoybean genome, each capable of being used as a probe or primer, eitheralone or in combination, for the detection of marker locus S08110-1-Q1on LG-L. In certain examples, SEQ ID NOs: 62 and 63 are used as primerswhile SEQ ID NOs: 64 and 65 are used as probes.

SEQ ID NOs: 66-69 comprise nucleotide sequences of regions of theSoybean genome, each capable of being used as a probe or primer, eitheralone or in combination, for the detection of marker locus S08111-1-Q1on LG-L. In certain examples, SEQ ID NOs: 66 and 67 are used as primerswhile SEQ ID NOs: 68 and 69 are used as probes.

SEQ ID NOs: 70-73 comprise nucleotide sequences of regions of theSoybean genome, each capable of being used as a probe or primer, eitheralone or in combination, for the detection of marker locus S08112-1-Q1on LG-L. In certain examples, SEQ ID NOs: 70 and 71 are used as primerswhile SEQ ID NOs: 72 and 73 are used as probes.

SEQ ID NOs: 74-77 comprise nucleotide sequences of regions of theSoybean genome, each capable of being used as a probe or primer, eitheralone or in combination, for the detection of marker locus S08115-2-Q1on LG-L. In certain examples, SEQ ID NOs: 74 and 75 are used as primerswhile SEQ ID NOs: 76 and 77 are used as probes.

SEQ ID NOs: 78-81 comprise nucleotide sequences of regions of theSoybean genome, each capable of being used as a probe or primer, eitheralone or in combination, for the detection of marker locus S08116-1-Q1on LG-L. In certain examples, SEQ ID NOs: 78 and 79 are used as primerswhile SEQ ID NOs: 80 and 81 are used as probes.

SEQ ID NOs: 82-85 comprise nucleotide sequences of regions of theSoybean genome, each capable of being used as a probe or primer, eitheralone or in combination, for the detection of marker locus S08117-1-Q1on LG-L. In certain examples, SEQ ID NOs: 82 and 83 are used as primerswhile SEQ ID NOs: 84 and 85 are used as probes.

SEQ ID NOs: 86-89 comprise nucleotide sequences of regions of theSoybean genome, each capable of being used as a probe or primer, eitheralone or in combination, for the detection of marker locus S08118-1-Q1on LG-L. In certain examples, SEQ ID NOs: 86 and 87 are used as primerswhile SEQ ID NOs: 88 and 89 are used as probes.

SEQ ID NOs: 90-93 comprise nucleotide sequences of regions of theSoybean genome, each capable of being used as a probe or primer, eitheralone or in combination, for the detection of marker locus S08119-1-Q1on LG-L. In certain examples, SEQ ID NOs: 90 and 91 are used as primerswhile SEQ ID NOs: 92 and 93 are used as probes.

SEQ ID NOs: 94-97 comprise nucleotide sequences of regions of theSoybean genome, each capable of being used as a probe or primer, eitheralone or in combination, for the detection of marker locus S04867-1-A onLG-L. In certain examples, SEQ ID NOs: 94 and 95 are used as primerswhile SEQ ID NOs: 96 and 97 are used as probes.

SEQ ID NOs: 98-101 comprise nucleotide sequences of regions of theSoybean genome, each capable of being used as a probe or primer, eitheralone or in combination, for the detection of marker locus S03859-1-A onLG-L. In certain examples, SEQ ID NOs: 98 and 99 are used as primerswhile SEQ ID NOs: 100 and 101 are used as probes.

SEQ ID NOs: 102-105 comprise nucleotide sequences of regions of theSoybean genome, each capable of being used as a probe or primer, eitheralone or in combination, for the detection of marker locus S08010-1-Q1on LG-L. In certain examples, SEQ ID NOs: 102 and 103 are used asprimers while SEQ ID NOs: 104 and 105 are used as probes.

SEQ ID NOs: 106-109 comprise nucleotide sequences of regions of theSoybean genome, each capable of being used as a probe or primer, eitheralone or in combination, for the detection of marker locus S08010-2-Q1on LG-L. In certain examples, SEQ ID NOs: 106 and 107 are used asprimers while SEQ ID NOs: 108 and 109 are used as probes.

SEQ ID NOs: 110-113 comprise nucleotide sequences of regions of theSoybean genome, each capable of being used as a probe or primer, eitheralone or in combination, for the detection of marker locus S08114-1-Q1on LG-L. In certain examples, SEQ ID NOs: 110 and 111 are used asprimers while SEQ ID NOs: 112 and 113 are used as probes.

SEQ ID NOs: 114-117 comprise nucleotide sequences of regions of theSoybean genome, each capable of being used as a probe or primer, eitheralone or in combination, for the detection of marker locus S08113-1-Q1on LG-L. In certain examples, SEQ ID NOs: 114 and 115 are used asprimers while SEQ ID NOs: 116 and 117 are used as probes.

SEQ ID NOs: 118-121 comprise nucleotide sequences of regions of theSoybean genome, each capable of being used as a probe or primer, eitheralone or in combination, for the detection of marker locus S08007-1-Q1on LG-L. In certain examples, SEQ ID NOs: 118 and 119 are used asprimers while SEQ ID NOs: 120 and 121 are used as probes.

DETAILED DESCRIPTION

It is to be understood that this invention is not limited to particularembodiments or examples, which can, of course, vary. It is also to beunderstood that the terminology used herein is for the purpose ofdescribing particular embodiments only, and is not intended to belimiting. Further, all publications referred to herein are incorporatedby reference herein for the purpose cited to the same extent as if eachwas specifically and individually indicated to be incorporated byreference herein.

Definitions

As used in this specification and the appended claims, terms in thesingular and the singular forms “a,” “an” and “the,” for example,include plural referents unless the content clearly dictates otherwise.Thus, for example, reference to “plant,” “the plant” or “a plant” alsoincludes a plurality of plants; also, depending on the context, use ofthe term “plant” can also include genetically similar or identicalprogeny of that plant; use of the term “a nucleic acid” optionallyincludes, as a practical matter, many copies of that nucleic acidmolecule; similarly, the term “probe” optionally (and typically)encompasses many similar or identical probe molecules.

Additionally, as used herein, “comprising” is to be interpreted asspecifying the presence of the stated features, integers, steps, orcomponents as referred to, but does not preclude the presence oraddition of one or more features, integers, steps, or components, orgroups thereof. Thus, for example, a kit comprising one pair ofoligonucleotide primers may have two or more pairs of oligonucleotideprimers. Additionally, the term “comprising” is intended to includeexamples encompassed by the terms “consisting essentially of” and“consisting of.” Similarly, the term “consisting essentially of” isintended to include examples encompassed by the term “consisting of.”

Certain definitions used in the specification and claims are providedbelow. In order to provide a clear and consistent understanding of thespecification and claims, including the scope to be given such terms,the following definitions are provided:

Agronomics,” “agronomic traits,” and “agronomic performance” refer tothe traits (and underlying genetic elements) of a given plant varietythat contribute to yield over the course of a growing season. Individualagronomic traits include emergence vigor, vegetative vigor, stresstolerance, disease resistance or tolerance, insect resistance ortolerance, herbicide resistance or tolerance, branching, flowering, seedset, seed size, seed density, standability, threshability, and the like.

“Allele” means any of one or more alternative forms of a geneticsequence. In a diploid cell or organism, the two alleles of a givensequence typically occupy corresponding loci on a pair of homologouschromosomes. With regard to a SNP marker, allele refers to the specificnucleotide base present at that SNP locus in that individual plant.

The term “amplifying” in the context of nucleic acid amplification isany process whereby additional copies of a selected nucleic acid (or atranscribed form thereof) are produced. Typical amplification methodsinclude various polymerase based replication methods, including thepolymerase chain reaction (PCR), ligase mediated methods, such as theligase chain reaction (LCR), and RNA polymerase based amplification(e.g., by transcription) methods. An “amplicon” is an amplified nucleicacid, e.g., a nucleic acid that is produced by amplifying a templatenucleic acid by any available amplification method (e.g., PCR, LCR,transcription, or the like).

An “ancestral line” is a parent line used as a source of genes, e.g.,for the development of elite lines.

An “ancestral population” is a group of ancestors that have contributedthe bulk of the genetic variation that was used to develop elite lines.

“Backcrossing” is a process in which a breeder crosses a progeny varietyback to one of the parental genotypes one or more times.

“Breeding” means the genetic manipulation of living organisms.

The term “chromosome segment” designates a contiguous linear span ofgenomic DNA that resides in planta on a single chromosome.

The term “crossed” or “cross” means the fusion of gametes viapollination to produce progeny (e.g., cells, seeds or plants). The termencompasses both sexual crosses (the pollination of one plant byanother) and selfing (self-pollination, e.g., when the pollen and ovuleare from the same plant).

“Cultivar” and “variety” are used synonymously and mean a group ofplants within a species (e.g., Glycine max) that share certain genetictraits that separate them from other possible varieties within thatspecies. Soybean cultivars are inbred lines produced after severalgenerations of self-pollinations. Individuals within a soybean cultivarare homogeneous, nearly genetically identical, with most loci in thehomozygous state.

An “elite line” is an agronomically superior line that has resulted frommany cycles of breeding and selection for superior agronomicperformance. Numerous elite lines are available and known to those ofskill in the art of soybean breeding.

An “elite population” is an assortment of elite individuals or linesthat can be used to represent the state of the art in terms ofagronomically superior genotypes of a given crop species, such assoybean.

An “equivalent position” in a polynucleotide and/or polypeptide sequenceis a position that correlates to a position in the reference sequencewhen the sequences are aligned for a maximum correspondence. In someexamples, the sequences are aligned across their whole length using aglobal alignment program. In other examples, a portion of the sequenceor sequences may be aligned using a local alignment program or a globalalignment program, for example a sequence may comprise exons andintrons, conserved motifs or domains, or functional motifs or domainswhich may be aligned to the reference sequence(s) to identify equivalentpositions. Equivalent positions in polynucleotides encoding apolypeptide can be determined using the encoded amino acid, and/or usinga FrameAlign program to align the polynucleotide and polypeptide formaximal correspondence.

As used herein, the terms “exogenous” or “heterologous,” as applied topolynucleotides or polypeptides, refer to molecules that have beenartificially supplied to a biological system (e.g., a plant cell, aplant gene, a particular plant species or a plant chromosome understudy) and are not native to that particular biological system. Theterms indicate that the relevant material originated from a source otherthan the naturally occurring source, or refers to molecules having anon-natural configuration, genetic location or arrangement of parts. Forexample, exogenous polynucleotides include polynucleotides from anotherorganism or from the same organism which have been modified by linkageto a distinct non-endogenous polynucleotide and/or inserted to adistinct non-endogenous locus. In contrast, for example, a “native” or“endogenous” gene is a gene that does not contain nucleic acid elementsencoded by sources other than the chromosome or other genetic element onwhich it is normally found in nature. An endogenous gene, transcript orpolypeptide is encoded by its natural chromosomal locus, and notartificially supplied to the cell. The term “introduced,” when referringto a heterologous or exogenous nucleic acids, refers to theincorporation of a nucleic acid into a eukaryotic or prokaryotic cellusing any type of suitable vector (e.g., naked linear DNA, plasmid,plastid, or virion), converted into an autonomous replicon, ortransiently expressed (e.g., transfected mRNA). The term includes suchnucleic acid introduction means as “transfection,” “transformation,” and“transduction.” The term “host cell” means a cell that contains anexogenous nucleic acid, such as a vector, and supports the replicationand/or expression of the nucleic acid. Host cells may be prokaryoticcells such as E. coli, or eukaryotic cells such as yeast, insect,amphibian or mammalian cells. In some examples, host cells are plantcells, including, but not limited to, dicot and monocot cells.

An “exotic soybean strain” or an “exotic soybean germplasm” is a strainor germplasm derived from a soybean not belonging to an available elitesoybean line or strain of germplasm. In the context of a cross betweentwo soybean plants or strains of germplasm, an exotic germplasm is notclosely related by descent to the elite germplasm with which it iscrossed. Most commonly, the exotic germplasm is not derived from anyknown elite line of soybean, but rather is selected to introduce novelgenetic elements (typically novel alleles) into a breeding program.

A “genetic map” is a description of genetic linkage relationships amongloci on one or more chromosomes (or linkage groups) within a givenspecies, generally depicted in a diagrammatic or tabular form.

“Genotype” refers to the genetic constitution of a cell or organism.

“Germplasm” means the genetic material that comprises the physicalfoundation of the hereditary qualities of an organism. As used herein,germplasm includes seeds and living tissue from which new plants may begrown; or, another plant part, such as leaf, stem, pollen, or cells,that may be cultured into a whole plant. Germplasm resources providesources of genetic traits used by plant breeders to improve commercialcultivars.

An individual is “homozygous” if the individual has only one type ofallele at a given locus (e.g., a diploid individual has a copy of thesame allele at a locus for each of two homologous chromosomes). Anindividual is “heterozygous” if more than one allele type is present ata given locus (e.g., a diploid individual with one copy each of twodifferent alleles). The term “homogeneity” indicates that members of agroup have the same genotype at one or more specific loci. In contrast,the term “heterogeneity” is used to indicate that individuals within thegroup differ in genotype at one or more specific loci.

“Haplotype” means a combination of sequence polymorphisms that arelocated closely together on the same chromosome and that candiscriminate between different genotypes. The combination represented bythe haplotype tends to be inherited together, and this combination mayrepresent sequence differences or alleles within a region. The regionmay contain one gene, or more than one gene.

The term “homologous” refers to nucleic acid sequences that are derivedfrom a common ancestral gene through natural or artificial processes(e.g., are members of the same gene family), and thus, typically sharesequence similarity. Typically, homologous nucleic acids have sufficientsequence identity that one of the sequences or a subsequence thereof orits complement is able to selectively hybridize to the other underselective (e.g., stringent) hybridization conditions. The term“selectively hybridizes” includes reference to hybridization, understringent hybridization conditions, of a nucleic acid sequence to aspecified nucleic acid target sequence to a detectably greater degree(e.g., at least 2-fold over background) than its hybridization tonon-target nucleic acid sequences and to the substantial exclusion ofnon-target nucleic acids. Selectively hybridizing nucleic acid sequencestypically have about at least 70% sequence identity, at least 80%sequence identity, or about 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%,99%, 99.5%, 99.75%, or 100% sequence identity with each other. A nucleicacid that exhibits at least some degree of homology to a referencenucleic acid can be unique or identical to the reference nucleic acid orits complementary sequence.

The term “introgression” refers to the transmission of a desired alleleof a genetic locus from one genetic background to another by sexualcrossing, transgenic means, or any other means known in the art. Forexample, introgression of a desired allele at a specified locus can betransmitted to at least one progeny plant via a sexual cross between twoparent plants, at least one of the parent plants having the desiredallele within its genome. Alternatively, for example, transmission of anallele can occur by recombination between two donor genomes, e.g., in afused protoplast, where at least one of the donor protoplasts has thedesired allele in its genome. The desired allele can be, e.g., atransgene or a gene allele that imparts resistance to a plant pathogen.

The term “isolated” refers to material, such as polynucleotides orpolypeptides, which are identified and separated from at least onecontaminant with which it is ordinarily associated in its natural ororiginal source. Furthermore, an isolated polynucleotide or polypeptideis typically present in a form or setting that is different from theform or setting that is normally found in nature. In some examples, theisolated molecule is substantially free from components that normallyaccompany or interact with it in its naturally occurring environment. Insome embodiments, the isolated material optionally comprises materialnot found with the material in its natural environment, e.g., in a cell.

A “line” or “strain” is a group of individuals of identical parentagethat are generally inbred to some degree and that are generallyhomozygous and homogeneous at most loci (isogenic or near isogenic). A“subline” refers to an inbred subset of descendents that are geneticallydistinct from other similarly inbred subsets descended from the sameprogenitor. Traditionally, a subline has been derived by inbreeding theseed from an individual soybean plant selected at the F3 to F5generation until the residual segregating loci are “fixed” or homozygousacross most or all loci. Commercial soybean varieties (or lines) aretypically produced by aggregating (“bulking”) the self-pollinatedprogeny of a single F3 to F5 plant from a controlled cross between twogenetically different parents. While the variety typically appearsuniform, the self-pollinating variety derived from the selected planteventually (e.g., F8) becomes a mixture of homozygous plants that canvary in genotype at any locus that was heterozygous in the originallyselected F3 to F5 plant. Marker-based sublines that differ from eachother based on qualitative polymorphism at the DNA level at one or morespecific marker loci are derived by genotyping a sample of seed derivedfrom individual self-pollinated progeny derived from a selected F3-F5plant. The seed sample can be genotyped directly as seed, or as planttissue grown from such a seed sample. Optionally, seed sharing a commongenotype at the specified locus (or loci) are bulked providing a sublinethat is genetically homogenous at identified loci important for a traitof interest (e.g., yield, tolerance, etc.).

“Linkage” refers to a phenomenon wherein alleles on the same chromosometend to segregate together more often than expected by chance if theirtransmission was independent. Genetic recombination occurs with anassumed random frequency over the entire genome. Genetic maps areconstructed by measuring the frequency of recombination between pairs oftraits or markers. The closer the traits or markers lie to each other onthe chromosome, the lower the frequency of recombination, and thegreater the degree of linkage. Traits or markers are considered hereinto be linked if they generally co-segregate. A 1/100 probability ofrecombination per generation is defined as a map distance of 1.0centiMorgan (1.0 cM). For example, in soybean, 1 cM correlates, onaverage, to about 400,000 base pairs (400 Kb).

The genetic elements or genes located on a single chromosome segment arephysically linked. Advantageously, the two loci are located in closeproximity such that recombination between homologous chromosome pairsdoes not occur between the two loci during meiosis with high frequency,e.g., such that linked loci co-segregate at least about 90% of the time,e.g., 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5%, 99.75%, ormore of the time. The genetic elements located within a chromosomesegment are also genetically linked, typically within a geneticrecombination distance of less than or equal to 50 centimorgans (cM),e.g., about 49, 40, 30, 20, 10, 5, 4, 3, 2, 1, 0.75, 0.5, or 0.25 cM orless. That is, two genetic elements within a single chromosome segmentundergo recombination during meiosis with each other at a frequency ofless than or equal to about 50%, e.g., about 49%, 40%, 30%, 20%, 10%,5%, 4%, 3%, 2%, 1%, 0.75%, 0.5%, or 0.25% or less. Closely linkedmarkers display a cross over frequency with a given marker of about 10%or less (the given marker is within about 10 cM of a closely linkedmarker). Put another way, closely linked loci co-segregate at leastabout 90% of the time.

When referring to the relationship between two genetic elements, such asa genetic element contributing to resistance and a proximal marker,“coupling” phase linkage indicates the state where the “favorable”allele at the resistance locus is physically associated on the samechromosome strand as the “favorable” allele of the respective linkedmarker locus. In coupling phase, both favorable alleles are inheritedtogether by progeny that inherit that chromosome strand. In “repulsion”phase linkage, the “favorable” allele at the locus of interest (e.g., aQTL for resistance) is physically linked with an “unfavorable” allele atthe proximal marker locus, and the two “favorable” alleles are notinherited together (i.e., the two loci are “out of phase” with eachother).

“Linkage disequilibrium” refers to a phenomenon wherein alleles tend toremain together in linkage groups when segregating from parents tooffspring, with a greater frequency than expected from their individualfrequencies.

“Linkage group” refers to traits or markers that generally co-segregate.A linkage group generally corresponds to a chromosomal region containinggenetic material that encodes the traits or markers.

“Locus” is a defined segment of DNA.

A “map location” is an assigned location on a genetic map relative tolinked genetic markers where a specified marker can be found within agiven species. Markers are frequently described as being “above” or“below” other markers on the same linkage group; a marker is “above”another marker if it appears earlier on the linkage group, whereas amarker is “below” another marker if it appears later on the linkagegroup.

“Mapping” is the process of defining the linkage relationships of locithrough the use of genetic markers, populations segregating for themarkers, and standard genetic principles of recombination frequency.

“Marker” or “molecular marker” is a term used to denote a nucleic acidor amino acid sequence that is sufficiently unique to characterize aspecific locus on the genome. Examples include Restriction FragmentLength Polymorphisms (RFLPs), Single Sequence Repeats (SSRs), TargetRegion Amplification Polymorphisms (TRAPs), Isozyme Electrophoresis,Randomly Amplified Polymorphic DNAs (RAPDs), Arbitrarily PrimedPolymerase Chain Reaction (AP-PCR), DNA Amplification Fingerprinting(DAF), Sequence Characterized Amplified Regions (SCARs), AmplifiedFragment Length Polymorphisms (AFLPs), and Single NucleotidePolymorphisms (SNPs). Additionally, other types of molecular markers areknown to the art, and phenotypic traits may also be used as markers. Allmarkers are used to define a specific locus on the soybean genome. Largenumbers of these markers have been mapped. Each marker is therefore anindicator of a specific segment of DNA, having a unique nucleotidesequence. The map positions provide a measure of the relative positionsof particular markers with respect to one another. When a trait isstated to be linked to a given marker it will be understood that theactual DNA segment whose sequence affects the trait generallyco-segregates with the marker. More precise and definite localization ofa trait can be obtained if markers are identified on both sides of thetrait. By measuring the appearance of the marker(s) in progeny ofcrosses, the existence of the trait can be detected by relatively simplemolecular tests without actually evaluating the appearance of the traititself, which can be difficult and time-consuming because the actualevaluation of the trait requires growing plants to a stage and/or underspecific conditions where the trait can be expressed. Molecular markershave been widely used to determine genetic composition in soybeans.Shoemaker and Olsen, ((1993) Molecular Linkage Map of Soybean (Glycinemax L. Men.). p. 6.131-6.138. In S. J. O'Brien (ed.) Genetic Maps: LocusMaps of Complex Genomes. Cold Spring Harbor Laboratory Press. ColdSpring Harbor, N.Y.), developed a molecular genetic linkage map thatconsisted of 25 linkage groups with about 365 RFLP, 11 RAPD, threeclassical markers, and four isozyme loci. See also Shoemaker R. C.(1994) RFLP Map of Soybean. pp. 299-309 in R. L. Phillips and I. K.Vasil (ed.) DNA-based markers in plants. Kluwer Academic PressDordrecht, the Netherlands.

“Marker assisted selection” refers to the process of selecting a desiredtrait or desired traits in a plant or plants by detecting one or moremolecular markers from the plant, where the molecular marker is linkedto the desired trait.

The term “plant” includes reference to an immature or mature wholeplant, including a plant from which seed or grain or anthers have beenremoved. Seed or embryo that will produce the plant is also consideredto be the plant.

As used herein, the term “plant cell” includes, without limitation,cells within or derived from, for example and without limitation, plantseeds, plant tissue suspension cultures, plant tissue, plant tissueexplants, plant embryos, meristematic tissue, callus tissue, leaves,roots, shoots, gametophytes, sporophytes, pollen and microspores.

“Plant parts” means any portion or piece of a plant, including leaves,stems, buds, roots, root tips, anthers, seed, grain, embryo, pollen,ovules, flowers, cotyledons, hypocotyls, pods, flowers, shoots, stalks,tissues, tissue cultures, cells and the like.

“Polymorphism” means a change or difference between two related nucleicacids. A “nucleotide polymorphism” refers to a nucleic acid comprisingat least one nucleotide difference when compared to a related sequencewhen the two nucleic acids are aligned for maximal correspondence. A“genetic nucleotide polymorphism” refers to a nucleic acid comprising atleast one nucleotide difference when compared to a related sequence whenthe two nucleic acids are aligned for maximal correspondence, where thetwo nucleic acids are genetically related, i.e., homologous, forexample, where the nucleic acids are isolated from different strains ofa soybean plant, or from different alleles of a single strain, or thelike.

“Polynucleotide,” “polynucleotide sequence,” “nucleic acid sequence,”“nucleic acid fragment,” and “oligonucleotide” are used interchangeablyherein. These terms encompass nucleotide sequences and the like. Apolynucleotide may be a polymer of RNA or DNA that is single- ordouble-stranded, that optionally contains synthetic, non-natural, oraltered nucleotide bases. A polynucleotide in the form of a polymer ofDNA may be comprised of one or more strands of cDNA, genomic DNA,synthetic DNA, or mixtures thereof.

“Positional cloning” is a cloning procedure in which a target nucleicacid is identified and isolated by its genomic proximity to markernucleic acid. For example, a genomic nucleic acid clone can include partor all of two more chromosomal regions that are proximal to one another.If a marker can be used to identify the genomic nucleic acid clone froma genomic library, standard methods such as sub-cloning or sequencingcan be used to identify and or isolate subsequences of the clone thatare located near the marker.

“Primer” refers to an oligonucleotide (synthetic or occurringnaturally), which is capable of acting as a point of initiation ofnucleic acid synthesis or replication along a complementary strand whenplaced under conditions in which synthesis of a complementary strand iscatalyzed by a polymerase. Typically, primers are oligonucleotides from10 to 30 nucleic acids in length, but longer or shorter sequences can beemployed. Primers may be provided in double-stranded form, though thesingle-stranded form is preferred. A primer can further contain adetectable label, for example a 5′ end label.

“Probe” refers to an oligonucleotide (synthetic or occurring naturally)that is complementary (though not necessarily fully complementary) to apolynucleotide of interest and forms a duplexed structure byhybridization with at least one strand of the polynucleotide ofinterest. Typically, probes are oligonucleotides from 10 to 50 nucleicacids in length, but longer or shorter sequences can be employed. Aprobe can further contain a detectable label. The terms “label” and“detectable label” refer to a molecule capable of detection, including,but not limited to, radioactive isotopes, fluorescers, chemiluminescers,enzymes, enzyme substrates, enzyme cofactors, enzyme inhibitors,chromophores, dyes, metal ions, metal sols, semiconductor nanocrystals,ligands (e.g., biotin, avidin, streptavidin, or haptens), and the like.A detectable label can also include a combination of a reporter and aquencher, such as are employed in FRET probes or TaqMan™ probes. Theterm “reporter” refers to a substance or a portion thereof which iscapable of exhibiting a detectable signal, which signal can besuppressed by a quencher. The detectable signal of the reporter is,e.g., fluorescence in the detectable range. The term “quencher” refersto a substance or portion thereof which is capable of suppressing,reducing, inhibiting, etc., the detectable signal produced by thereporter. As used herein, the terms “quenching” and “fluorescence energytransfer” refer to the process whereby, when a reporter and a quencherare in close proximity, and the reporter is excited by an energy source,a substantial portion of the energy of the excited state nonradiativelytransfers to the quencher where it either dissipates nonradiatively oris emitted at a different emission wavelength than that of the reporter.

“RAPD marker” means random amplified polymorphic DNA marker. Chancepairs of sites complementary to single octa- or decanucleotides mayexist in the correct orientation and close enough to one another for PCRamplification. With some randomly chosen decanucleotides no sequencesare amplified. With others, the same length products are generated fromDNAs of different individuals. With still others, patterns of bands arenot the same for every individual in a population. The variable bandsare commonly called random amplified polymorphic DNA (RAPD) bands.

The term “recombinant” indicates that the material (e.g., a recombinantnucleic acid, gene, polynucleotide or polypeptide) has been altered byhuman intervention. Generally, the arrangement of parts of a recombinantmolecule is not a native configuration, or the primary sequence of therecombinant polynucleotide or polypeptide has in some way beenmanipulated. The alteration to yield the recombinant material can beperformed on the material within or removed from its natural environmentor state. For example, a naturally occurring nucleic acid becomes arecombinant nucleic acid if it is altered, or if it is transcribed fromDNA which has been altered, by means of human intervention performedwithin the cell from which it originates. A gene sequence open readingframe is recombinant if that nucleotide sequence has been removed fromit natural text and cloned into any type of artificial nucleic acidvector. Protocols and reagents to produce recombinant molecules,especially recombinant nucleic acids, are common and routine in the art(see, e.g., Maniatis et al. (eds.), Molecular Cloning: A LaboratoryManual, Cold Spring Harbor Laboratory Press, NY, [1982]; Sambrook et al.(eds.), Molecular Cloning: A Laboratory Manual, Second Edition, Volumes1-3, Cold Spring Harbor Laboratory Press, NY, [1989]; and Ausubel et al.(eds.), Current Protocols in Molecular Biology, Vol. 1-4, John Wiley &Sons, Inc., New York [1994]). The term recombinant can also refer to anorganism that harbors a recombinant material, e.g., a plant thatcomprises a recombinant nucleic acid is considered a recombinant plant.In some embodiments, a recombinant organism is a transgenic organism.

“Recombination frequency” is the frequency of a crossing over event(recombination) between two genetic loci. Recombination frequency can beobserved by following the segregation of markers and/or traits duringmeiosis. A marker locus is “associated with” another marker locus orsome other locus (for example, a tolerance locus), when the relevantloci are part of the same linkage group and are in linkagedisequilibrium. This occurs when the marker locus and a linked locus arefound together in progeny plants more frequently than if the two locisegregated randomly. Similarly, a marker locus can also be associatedwith a trait, e.g., a marker locus can be “associated with tolerance orimproved tolerance,” when the marker locus is in linkage disequilibriumwith the trait.

“RFLP” means restriction fragment length polymorphism. Any sequencechange in DNA, including a single base substitution, insertion, deletionor inversion, can result in loss or gain of a restriction endonucleaserecognition site. The size and number of fragments generated by one suchenzyme is therefore altered. A probe that hybridizes specifically to DNAin the region of such an alteration can be used to rapidly andspecifically identify a region of DNA that displays allelic variationbetween two plant varieties. Isozyme Electrophoresis and RFLPs have beenwidely used to determine genetic composition

“Self crossing” or “self pollination” or “selfing” a process throughwhich a breeder crosses progeny with itself; for example, a secondgeneration hybrid F2 with itself to yield progeny designated F2:3.

“SNP” or “single nucleotide polymorphism” means a sequence variationthat occurs when a single nucleotide (A, T, C, or G) in the genomesequence is altered or variable. “SNP markers” exist when SNPs aremapped to sites on the soybean genome. Many techniques for detectingSNPs are known in the art, including allele specific hybridization,primer extension, direct sequencing, and real-time PCR, such as theTaqMan™ assay.

“SSR” means short sequence repeats. “SSR markers” are genetic markersbased on polymorphisms in repeated nucleotide sequences, such asmicrosatellites. A marker system based on SSRs can be highly informativein linkage analysis relative to other marker systems in that multiplealleles may be present. The PCR detection is done by use of twooligonucleotide primers flanking the polymorphic segment of repetitiveDNA. Repeated cycles of heat denaturation of the DNA followed byannealing of the primers to their complementary sequences at lowtemperatures, and extension of the annealed primers with DNA polymerase,comprise the major part of the methodology.

“Tolerance” and “improved tolerance” are used interchangeably herein andrefer to plants in which higher doses of an herbicide are required toproduce effects similar to those seen in non-tolerant plants. Tolerantplants typically exhibit fewer necrotic, lytic, chlorotic, or otherlesions when subjected to the herbicide at concentrations and ratestypically employed by the agricultural community. A “tolerant plant” or“tolerant plant variety” need not possess absolute or complete tolerancesuch that no detrimental effect to the plant or plant variety isobserved when the given herbicide is applied. Instead, a “tolerantplant,” “tolerant plant variety,” or a plant or plant variety with“improved tolerance” will simply be less affected by the given herbicidethan a comparable susceptible plant or variety.

“Transgenic plant” refers to a plant that comprises within its cells anexogenous polynucleotide, e.g., a polynucleotide from another organism(including a polynucleotide from another soybean plant). Generally, theexogenous polynucleotide is stably integrated within a genome such thatthe polynucleotide is passed on to successive generations. The exogenouspolynucleotide may be integrated into the genome alone or as part of arecombinant expression cassette. “Transgenic” is used herein to refer toany cell, cell line, callus, tissue, plant part, or plant, the genotypeof which has been altered by the presence of exogenous nucleic acidincluding those transgenic organisms or cells initially so altered, aswell as those created by crosses or asexual propagation from the initialtransgenic organism or cell. The term “transgenic” as used herein doesnot encompass the alteration of the genome (chromosomal orextra-chromosomal) by conventional plant breeding methods (e.g.,crosses) or by naturally occurring events such as randomcross-fertilization, non-recombinant viral infection, non-recombinantbacterial transformation, non-recombinant transposition, or spontaneousmutation.

“TRAP marker” means target region amplification polymorphism marker. TheTRAP technique employs one fixed primer of known sequence in combinationwith a random primer to amplify genomic fragments. The differences infragments between alleles can be detected by gel electrophoresis.

The term “vector” is used in reference to polynucleotide or othermolecules that transfer nucleic acid segment(s) into a cell. A vectoroptionally comprises parts which mediate vector maintenance and enableits intended use (e.g., sequences necessary for replication, genesimparting drug or antibiotic resistance, a multiple cloning site,operably linked promoter/enhancer elements which enable the expressionof a cloned gene, etc.). Vectors are often derived from plasmids,bacteriophages, or plant or animal viruses.

The term “yield” refers to the productivity per unit area of aparticular plant product of commercial value. For example, yield ofsoybean is commonly measured in bushels of seed per acre or metric tonsof seed per hectare per season. Yield is affected by both genetic andenvironmental factors. Yield is the final culmination of all agronomictraits.

Mesotrione and Isoxazole

Mesotrione and isoxazole are two herbicide classes from differentchemical families, but both can act as hydroxyphenyl pyruvatedioxygenase (HPPD) inhibitors. Isoxazole is used as a pre-plantherbicide while mesotrione is used as either a pre-plant orpost-emergent herbicide. Isoxazole is member of the isoxazole chemicalfamily. Following either foliar or root uptake, isoxazole is rapidlyconverted to a diketonitrile derivative(2-cyclopropyl-3-(2-mesyl-4-trifluoromethylphenyl)-3-oxopropanenitrile)by opening of the isoxazole ring. This diketonitrile undergoesdegradation to a benzoic acid derivative (2-mesyl-4-trifluoromethylbenzoic acid) in treated plants and the extent of this degradation iscorrelated to the degree of susceptibility, being most rapid in tolerantplants and slowest in susceptible plants.

Mesotrione belongs to the triketone family of herbicides, which arechemically derived from a natural phytotoxin produced by the bottlebrushplant Callistemon citrinus. Mesotrione works by inhibiting HPPD(p-hydroxyphenylpyruvate dioxygenase), an essential enzyme in thebiosynthesis of carotenoids. Carotenoids protect chlorophyll from excesslight energy.

Molecular Markers and Genetic Linkage

Table A below provides an integrated genetic map of soybean markers onlinkage group L (chromosome 19), including the marker type (SSR orASH/SNP). The genetic map positions of the markers are indicated incentiMorgans (cM), typically with position zero being the first (mostdistal) marker on the chromosome. The map includes relative positionsfor some markers for which higher resolution genetic mapping data wasnot available; no position in cM is provided for such markers. Table Blists genetic markers that are linked to the mesotrione and isoxazoleherbicide tolerance and sensitivity markers identified on linkage groupL. These markers are from the soybean public composite map of Jun. 18,2008 for linkage group L.

TABLE A Marker Linkage Group Position Type SATT495 L 0.00 SSR SATT723 L0.44 SSR SAT_408 L 1.00 SSR S08102-1-Q1 L SNP S08103-1-Q1 S08104-1-Q1S08106-1-Q1 S08107-1-Q1 S08107-1-Q1 S08109-1-Q1 S08110-1-Q1 S08111-1-Q1S08115-2-Q1 S08117-1-Q1 S08119-1-Q1 S08116-1-Q1 S08112-1-Q1 S08108-1-Q1S08101-4-Q1 S08101-1-Q1 S08101-2-Q1 S08101-3-Q1 S08118-1-Q1 S08114-1-Q1S08113-1-Q1 S03859-1-A Sat_301 L 10.31 SSR SATT446 L 11.13 SSR P10649C-3L 12.5 ASH SATT232 L 12.55 SSR S08105-1-Q1 L SNP SATT182 L 13.90 SSRS08010-1-Q1 L SNP S08010-2-Q1 SATT238 L 19.41 SSR Sat_071 L 20.04 SSRSATT388 L 21.61 SSR SATT497 L 26.06 SSR SATT313 L 27.35 SSR SATT143 L28.16 SSR Sat_397 L 28.26 SSR SATT418 L 28.57 SSR Sat_134 L 28.66 SSRSATT652 L 28.67 SSR SATT711 L 28.67 SSR Sat_187 L 28.68 SSR Sat_195 L28.68 SSR Sat_388 L 28.71 SSR SATT694 L 28.71 SSR SATT398 L 28.90 SSRSat_191 L 29.19 SSR Sat_405 L 29.40 SSR Sat_320 L 29.74 SSR SATT523 L30.18 SSR SATT278 L 30.34 SSR SATT613 L 32.64 SSR

TABLE B Linked Markers Satt495 Satt723 Sat_408 A169_1 EV2_1 Sle3_4sBLT010_2 BLT007_1 Satt232 Sat_301 Satt446 Satt182 R176_1 JUBC090 Satt238Sat_071 BLT039_1 Bng071_1 Satt388 A264_1 RGA_7 RGA7 Satt523 Sat_134 LbAi8_2 A450_2 A106_1 Sat_405 Satt143 B124_2 A459_1 Satt398 Satt694 Sat_195Sat_388 Satt652 Satt711 Sat_187 Satt418 Satt278 Sat_397 Sat_191 Sat_320O109_1 A204_2 Satt497 G214_17 Satt313 B164_1 G214_16 Satt613 A023_1Satt284 AW508247 Satt462 L050_7 E014_1 A071_5 B046_1 L1 B162_2 S00224-1S01659-1

Table C provides examples of primer and probe nucleic acid sequencesthat are useful for detecting SNP markers associated with tolerance,improved tolerance, or susceptibility/sensitivity to mesotrione and/orisoxazole herbicides.

TABLE C Marker Name PCR Primers Allele Probes P10649C-3Primer Seq 1 (SEQ ID NO. 1): Allele 1 Probe (SEQ ID NO. 3): LG-LGAGGGCTATGTTTTCTTCT TCATcTgTGATAA CCAGATGTGAGAllele 2 Probe (SEQ ID NO. 4): Primer Seq 2 (SEQ ID NO. 2):TCATgTgTGATAA AAGGTCGGCTTGGTGGTTA Allele 3 Probe (SEQ ID NO. 5): AAGGCAGTCATcTcTGATAA S00224-1 Primer Seq 1 (F) (SEQ ID NO.Allele 1 Probe (PF1) (SEQ ID NO. 8): LG-L 6): CGCGAcTCTCCTCCTGGACCTACCCGGGATG Allele 2 Probe (PV1) (SEQ ID NO. 9): AAAACGCGAgTCTCCTC Primer Seq 2 (R) (SEQ ID NO.  7): TCTTCCTCTCCCTTCCTCTC GCP5467-1 Primer Seq 1 (SEQ ID NO. 10): Allele 1 Probe (SEQ ID NO. 12):LG-N TCCCAGGTTAGATTTTCTG CACTCCTTAAGgTAAT AACGAAGAAllele 2 Probe (SEQ ID NO. 13): Primer Seq 2 (SEQ ID NO. 11):CACTCCTTAAGaTAAT CATCAGCACAAAAGGGCA TCCTCA S08101-1Primer Seq 1 (F) (SEQ ID NO. Allele 1 Probe (PF1) (SEQ ID NO. 16) Q114): aacggAtcatcacaac LG-L gttatcgtcaccaccaccaaAllele 2 Probe (PV1) (SEQ ID NO. 17) Primer Seq 2 (R) (SEQ ID NO.aacggCtcatcacaa 15): cacaacacgagtagccgtagg S08101-2-Primer Seq 1(F) (SEQ ID NO. Allele 1 Probe (PF1) (SEQ ID NO. 20) Q118): cgacaatggcctttacacct acaccAtttttcatcc LG-LPrimer Seq 2 (R) (SEQ ID NO. Allele 2 Probe (PV1) (SEQ ID NO. 21)19): tcgatatggacgaaggagga acaccCtttttcatcc S08101-3-Primer Seq 1 (F) (SEQ ID NO. Allele 1 Probe (PF1) (SEQ ID NO. 24) Q122): actgctGctttgtcta LG-L GCAATCACATTTGCATTCCAllele 2 Probe (PV1) (SEQ ID NO. 25) TTA ctactgctActttgtcPrimer Seq 2 (R) (SEQ ID NO. 23): TCTGAACGAGTTGTGCAAG AA S08101-4-Primer Seq 1 (F) (SEQ ID NO. Allele 1 Probe (PF1) (SEQ ID NO. 28) Q126): acctcgtattggtggtggtg acttccctcGtttcg LG-LPrimer Seq 2 (R) (SEQ ID NO. Allele 2 Probe (PV1) (SEQ ID NO. 29)27): gaatgttcagtgcgagcaac cttccctcAtttcg S08102-1-Primer Seq 1 (F) (SEQ ID NO. Allele 1 Probe (PF1) (SEQ ID NO. 32) Q130): caaaaggaaagaagaaccgtgt atgattgaagcagGaaa LG-LPrimer Seq 2 (R) (SEQ ID NO. Allele 2 Probe (PV1) (SEQ ID NO. 33)31): tccaacctatgtgttggtgtg tcatgattgaagcagCaa S08103-1-Primer Seq 1 (F) (SEQ ID NO. Allele 1 Probe (PF1) (SEQ ID NO. 36) Q134): cttgttctagactgatCat LG-L ggagacttgacttaaagagaaagaaaaAllele 2 Probe (PV1) (SEQ ID NO. 37) Primer Seq 2 (R) (SEQ ID NO.ctagactgatAattca 35): cggaaagaaaaacaatagattgaatg S08104-1-Primer Seq 1 (F) (SEQ ID NO. Allele 1 Probe (PF1) (SEQ ID NO. 40) Q138): tcattcaagactacatgaaagacaaa atagtctcCcaaacac LG-LPrimer Seq 2 (R) (SEQ ID NO. Allele 2 Probe (PV1) (SEQ ID NO. 41)39): caagggagagcaatccttga atagtctcTcaaacacc S08105-1-Primer Seq 1 (F) (SEQ ID NO. Allele 1 Probe (PF1) (SEQ ID NO. 44) Q142): gaaactttccattttgcccttc cttcttCcactcttac LG-LPrimer Seq 2 (R) (SEQ ID NO. Allele 2 Probe (PV1) (SEQ ID NO. 45)43): agaacgcaggggagaagc ccttcttAcactcttac S08106-1-Primer Seq 1 (F) (SEQ ID NO. Allele 1 Probe (PF1) (SEQ ID NO. 48) Q146): cactctcctaTattgtc LG-L tgatatgacactctactaagatgtgttgAllele 2 Probe (PV1) (SEQ ID NO. 49) Primer Seq 2 (R) (SEQ ID NO.ctctcctaCattgtca 47): tgattcatccgcaaacttga S08107-1-Primer Seq 1 (F) (SEQ ID NO. Allele 1 Probe (PF1) (SEQ ID NO. 52) Q150): agatccttgttccaaattccaa ccaacacaatcTaact LG-LPrimer Seq 2 (R) (SEQ ID NO. Allele 2 Probe (PV1) (SEQ ID NO. 53)51): ccttggcttaatgggtgtgt ccaacacaatcGaa S08108-1-Primer Seq 1 (F) (SEQ ID NO. Allele 1 Probe (PF1) (SEQ ID NO. 56) Q154): atggaggcaagcttgtgttt cttcataaaCgccaaag LG-LPrimer Seq 2 (R) (SEQ ID NO. Allele 2 Probe (PV1) (SEQ ID NO. 57)55): catgctaccagcatctgcaa cataaaTgccaaagca S08109-1-Primer Seq 1 (F) (SEQ ID NO. Allele 1 Probe (PF1) (SEQ ID NO. 60) Q158): aatgagcaagggagaggaca aagcacTactttcaattg LG-LPrimer Seq 2 (R) (SEQ ID NO. Allele 2 Probe (PV1) (SEQ ID NO. 61)59): tcgccgctgctatttaattt aagcacCactttca S08110-1-Primer Seq 1 (F) (SEQ ID NO. Allele 1 Probe (PF1) (SEQ ID NO. 64) Q162): agatgccttgctcagtggac ccccaTcaccatac LG-LPrimer Seq 2 (R) (SEQ ID NO. Allele 2 Probe (PV1) (SEQ ID NO. 65)63): atgatgaatgtgttgagccaat accccaCcaccata S08111-1-Primer Seq 1 (F) (SEQ ID NO. Allele 1 Probe (PF1) (SEQ ID NO. 68) Q166): agaaaccttccaaagctcttgg caacatcCgagtcca LG-LPrimer Seq 2 (R) (SEQ ID NO. Allele 2 Probe (PV1) (SEQ ID NO. 69)67): tagggaggcacttgacaacc caacatcAgagtcca S08112-1-Primer Seq 1 (F) (SEQ ID NO. Allele 1 Probe (PF1) (SEQ ID NO. 72) Q170): ttttgacccccagagagttg ctatctcTacacgatgtgt LG-LPrimer Seq 2 (R) (SEQ ID NO. Allele 2 Probe (PV1) (SEQ ID NO. 73)71): ttgcaagcctaaaggatggt ctatctcCacacgatg S08115-2-Primer Seq 1 (F) (SEQ ID NO. Allele 1 Probe (PF1) (SEQ ID NO. 76) Q174): tcccacttgatcttgcagaa cctccaatGgcatac LG-LPrimer Seq 2 (R) (SEQ ID NO. Allele 2 Probe (PV1) (SEQ ID NO. 77)75): tacggtgggtggattattcg cctccaatAgcatacat S08116-1-Primer Seq 1 (F) (SEQ ID NO. Allele 1 Probe (PF1) (SEQ ID NO. 80) Q178): agaaaagcagcagaaagaggac ctctaattCcacatctg LG-LPrimer Seq 2 (R) (SEQ ID NO. Allele 2 Probe (PV1) (SEQ ID NO. 81)79): cttcatgaatcccaacatcaga cctctaattTcacatctg S08117-1-Primer Seq 1 (F) (SEQ ID NO. Allele 1 Probe (PF1) (SEQ ID NO. 84) Q182): tcaaaccattttgtttcccagt ttgcattgtattCtct LG-LPrimer Seq 2 (R) (SEQ ID NO. Allele 2 Probe (PV1) (SEQ ID NO. 85)83): tgctagcctttgatacccaac ttgcattgtattTtc S08118-1-Primer Seq 1 (F) (SEQ ID NO. Allele 1 Probe (PF1) (SEQ ID NO. 88) Q186): gtctcaggcagtgaatctgct ttccgTgaagatc LG-LPrimer Seq 2 (R) (SEQ ID NO. Allele 2 Probe (PV1) (SEQ ID NO. 89)87): cagccttaccatcaacatcg atgcttccgCgaaga S08119-1-Primer Seq 1 (F) (SEQ ID NO. Allele 1 Probe (PF1) (SEQ ID NO. 92) Q190): ggtagcagttactttgtgatgtaagc tactgaTcacaggttat LG-LPrimer Seq 2 (R) (SEQ ID NO. Allele 2 Probe (PV1) (SEQ ID NO. 93)91): catgcaataaaatccaaaacca tactgaCcacaggttat S04867-1-APrimer Seq 1 (F) (SEQ ID NO. Allele 1 Probe (PF1) (SEQ ID NO. 96) LG-L94.): ttgctttggaaaggactcca ctcggtgctgtTtt Primer Seq 2 (R) (SEQ ID NO.Allele 2 Probe (PV1) (SEQ ID NO. 97) 95): ctcggtgctgtCttcctcatcaactcctgctgct S03859-1-A Primer Seq 1 (F) (SEQ ID NO.Allele 1 Probe (PF1) (SEQ ID NO. 100) LG-L 98): gaaaccaattttgatgtgaaggacagccctAtctcac Primer Seq 2 (R) (SEQ ID NO.Allele 2 Probe (PV1) (SEQ ID NO. 101) 99): aagtgagaggggtgcaaagaagccctGtctcact S08010-1- Primer Seq 1 (F) (SEQ ID NO.Allele 1 Probe (PF1) (SEQ ID NO. 104) Q1 102): gcaaatgagaaggctgaagctcggtatcgctcgTca LG-L Primer Seq 2 (R) (SEQ ID NO.Allele 2 Probe (PV1) (SEQ ID NO. 105) 103): gctgtccctcagtccatcctatcgctcgCcaacg S08010-2- Primer Seq 1 (F) (SEQ ID NO.Allele 1 Probe (PF1) (SEQ ID NO. 108) Q1 106): atccacttgcaagataggacact cttgacattaagact:atcc LG-L Primer Seq 2 (R) (SEQ ID NO.Allele 2 Probe (PV1) (SEQ ID NO. 109) 107): gtgtaagtactgatgtgcagttttgaagactAatccttaaacaag S08114-1-Q1 Primer Seq 1 (F) (SEQ ID NO:Allele 1 Probe (PF1) (SEQ ID NO: 112) LG-L 110): ctattactcTccgttattttcaacaggttatgaatatacaggtcaa Allele 2 Probe (PV1) (SEQ ID NO: 113)Primer Seq 2(R) (SEQ ID NO: ctattactcCccgttatt111): catcaccaattgtttggagttc S08113-1- Primer Seq 1 (F) (SEQ ID NO:Allele 1 Probe (PF1) (SEQ ID NO: 116) Q1 114): ttgttgaatgggggcactttgaatgCttactctct LG-L Primer Seq 2 (R) (SEQ ID NO:Allele 2 Probe (PV1) (SEQ ID NO: 117) 115): ctcgagcaaatctcgatggtttgaatgTttactctcttt S08007-1- Primer Seq 1 (F) (SEQ ID NO:Allele 1 Probe (PF1) (SEQ ID NO: 120) Q1 118): agtctttgttttctctTtt LG-Lctgtggaggaggagcttgag Allele 2 Probe (PV1) (SEQ ID NO: 121)Primer Seq 2(R) (SEQ ID NO: agtctttgttttctctCtt119): acaagtcacaaccgtcaatgat

In traditional linkage analysis, no direct knowledge of the physicalrelationship of genes on a chromosome is required. Mendel's first law isthat factors of pairs of characteristics are segregated, meaning thatalleles of a diploid trait separate into two gametes and then intodifferent offspring. Classical linkage analysis can be thought of as astatistical description of the relative frequencies of cosegregation ofdifferent traits. Linkage analysis, as described previously, is thewell-characterized descriptive framework of how traits are groupedtogether based upon the frequency with which they segregate together.Because chromosomal distance is approximately proportional to thefrequency of crossing over events between traits, there is anapproximate physical distance that correlates with recombinationfrequency.

Marker loci are traits, and can be assessed according to standardlinkage analysis by tracking the marker loci during segregation. Thus,one cM is equal to a 1% chance that a marker locus will be separatedfrom another locus (which can be any other trait, e.g., another markerlocus, or another trait locus that encodes a QTL), due to crossing overin a single generation. Any detectible polymorphic trait can be used asa marker so long as it is inherited differentially and exhibits linkagedisequilibrium with a phenotypic trait of interest. A number of soybeanmarkers have been mapped and linkage groups created, as described inCregan, P. B. et al., “An Integrated Genetic Linkage Map of the SoybeanGenome” (1999) Crop Science 39:1464-90, and more recently in Choi etal., “A Soybean Transcript Map: Gene Distribution, Haplotype andSingle-Nucleotide Polymorphism Analysis” (2007) Genetics 176:685-96.Many soybean markers are publicly available at the USDA affiliatedsoybase website.

Most plant traits of agronomic importance are polygenic, otherwise knownas quantitative traits. A quantitative trait is controlled by two ormore genes located at various locations, or loci, in the plant's genome.The multiple genes have a cumulative effect which contributes to thecontinuous range of phenotypes observed in many plant traits. Thesegenes are referred to as quantitative trait loci (QTL). Recombinationfrequency measures the extent to which a molecular marker is linked witha QTL. Lower recombination frequencies, typically measured incentiMorgans (cM), indicate greater linkage between the QTL and themolecular marker. The extent to which two features are linked is oftenreferred to as the genetic distance. The genetic distance is alsotypically related to the physical distance between the marker and theQTL; however, certain biological phenomenon (including recombinational“hot spots”) can affect the relationship between physical distance andgenetic distance. Generally, the usefulness of a molecular marker isdetermined by the genetic and physical distance between the marker andthe selectable trait of interest.

The method for determining the presence or absence of a QTL associatedwith tolerance or sensitivity to mesotrione and/or isoxazole herbicidesin soybean germplasm, comprises analyzing genomic DNA from a soybeangermplasm for the presence of at least one molecular marker, wherein atleast one molecular marker is linked to the QTL, and wherein the QTLmaps to soybean major linkage group L and is associated with toleranceor sensitivity to mesotrione and/or isoxazole herbicides. The term “isassociated with” in this context means that the QTL associated withtolerance or sensitivity to mesotrione and/or isoxazole herbicides hasbeen found to be present in soybean plants showing tolerance orsensitivity to mesotrione and/or isoxazole herbicides as describedherein.

Any marker that is linked to a trait of interest (e.g., in the presentcase, a tolerance or improved tolerance trait) can be used as a markerfor that trait. Thus, in addition to the markers described herein,markers linked to the markers itemized herein can also be used topredict the tolerance, improved tolerance, or susceptibility/sensitivitytrait. Such linked markers are particularly useful when they aresufficiently proximal to a given marker so that they display a lowrecombination frequency with the given marker. Markers linked and/orclosely linked to the given markers are provided, for example, in TablesA and B above. These include, for example, SATT495, SATT723, Sat_408,A169_1, EV2_1, Sle3_4s, BLT010_2, BLT007_1, SATT232, S04867-1-A,S08102-1-Q1, S08103-1-Q1, S08104-1-Q1, S08106-1-Q1, S08107-1-Q1,S08109-1-Q1, S08110-1-Q1, S08111-1-Q1, S08115-2-Q1, S08117-1-Q1,S08119-1-Q1, S08116-1-Q1, S08112-1-Q1, S08108-1-Q1, S08101-4-Q1,S08101-1-Q1, S08101-2-Q1, S08101-3-Q1, S08118-1-Q1, S08114-1-Q1,S08113-1-Q1, S03859-1-A, Sat_301, SATT446, P10649C-3, SATT232,S08105-1-Q1, SATT182, S08010-1-Q1, S08010-2-Q1, R176_1, JUBC090,SATT238, Sat_071, BLT039_1, Bng071_1, SATT388, A264_1, RGA_7, RGA7,SATT523, Sat_134, S00224-1, S01659-1, LbA, i8_2, A450_2, A106_1,Sat_405, SATT143, B124_2, A459_1, SATT398, SATT694, Sat_195, Sat_388,SATT652, SATT711, Sat_187, SATT418, SATT278, Sat_397, Sat_191, Sat_320,O109_1, A204_2, SATT497, G214_17, SATT313, B164_1, G214_16, SATT613,A023_1, SATT284, AW508247, SATT462, L050_7, E014_1, A071_5, B046_1, L1,and B162_2.

Marker loci are especially useful when they are closely linked to targetloci (e.g., QTL for tolerance, or, alternatively, simply other markerloci, such as those identified herein, that are linked to such QTL) forwhich they are being used as markers. A marker more closely linked to atarget locus is a better indicator for the target locus (due to thereduced cross-over frequency between the target locus and the marker).Thus, in one example, closely linked loci such as a marker locus and asecond locus (e.g., a given marker or a QTL) display an inter-locuscross-over frequency of about 10% or less, about 9% or less, about 8% orless, about 7% or less, about 6% or less, about 5% or less, about 4% orless, about 3% or less, or about 2% or less. In some examples, therelevant loci (e.g., a marker locus and a target locus such as a QTL)display a recombination a frequency of about 1% or less, e.g., about0.75% or less, about 0.5% or less, or about 0.25% or less. Thus, theloci are about 10 cM, 9 cM, 8 cM, 7 cM, 6 cM, 5 cM, 4 cM, 3 cM, 2 cM, 1cM, 0.75 cM, 0.5 cM or 0.25 cM or less apart. Put another way, two locithat are localized to the same chromosome, and at such a distance thatrecombination between the two loci occurs at a frequency of no more than10% (e.g., about 9%, 8%, 7%, 6%, 5%, 4%, 3%, 2%, 1%, 0.75%, 0.5%, 0.25%,or less) are said to be proximal to each other.

Many marker alleles can be detected or selected for or against.Optionally, one, two, three, or more marker allele(s) can be identifiedin or introgressed into the plant. Plants or germplasm frequently areidentified that have at least one favorable allele that positivelycorrelates with tolerance or improved tolerance. However, it is usefulfor exclusionary purposes during breeding to also identify alleles thatnegatively correlate with tolerance, to eliminate such plants orgermplasm from subsequent rounds of breeding.

The identification of favorable marker alleles may begermplasm-specific. The determination of which marker alleles correlatewith tolerance (or non-tolerance) is determined for the particulargermplasm under study. One of skill recognizes that methods foridentifying favorable alleles are routine and well known, and,furthermore, that the identification and use of such favorable allelesis well within the scope of the invention.

Numerous markers disclosed herein have been found to be associated withor to correlate with tolerance, improved tolerance, orsusceptibility/sensitivity to mesotrione and/or isoxazole herbicides insoybean. Generally, markers that map closer to the QTL mapped to linkagegroup L and associated with tolerance or sensitivity to mesotrioneand/or isoxazole herbicides are superior to markers that map fartherfrom the QTL. In some examples, a marker used to determine the presenceor absence of a QTL mapping to soybean linkage group L and associatedwith tolerance or sensitivity to mesotrione and/or isoxazole herbicidesincludes one or more of SATT495, P10649C-3, SATT182, S03859-1, S00224-1,SATT388, SATT313, and SATT613, or other markers above marker SATT613 onLG-L. Additional useful and/or relevant markers include S03859-1-A,S08103-1-Q1, S08104-1-Q1, S08106-1-Q1, S08110-1-Q1, S08111-1-Q1,S08115-2-Q1, S08117-1-Q1, S08119-1-Q1, S08118-1-Q1, S08116-1-Q1,S08114-1-Q1, S08113-1-Q1, S08112-1-Q1, S08108-1-Q1, S08101-2-Q1,S08101-3-Q1, S08101-4-Q1, S08105-1-Q1, S08102-1-Q1, S08107-1-Q1,S08109-1-Q1, and S08101-1-Q1. Any marker assigned to soybean linkagegroup L and linked or closely linked to a marker disclosed herein asassociated with tolerance or sensitivity to mesotrione and/or isoxazoleherbicides may be used. Generally, a linked marker is within 50 cM ofthe referenced marker or trait, and a closely linked marker is within 10cM of the referenced marker or trait. Updated information regardingmarkers assigned to soybean linkage group L may be found on the USDA'sSoybase website. Further, linkage group L is now formally referred to aschromosome #19.

Intervals defined by markers flanking the QTL associated with toleranceor sensitivity to mesotrione and/or isoxazole herbicides are useful, aswell. For interval determination, the genomic DNA of soybean germplasmis typically tested for the presence of at least two of the foregoingmolecular markers, one marker on each side of the QTL. Examples of suchintervals include the interval flanked by and including SATT613 andabove on LG-L, the interval flanked by and including markers SATT495 andSATT613, the interval flanked by and including SATT313 and above onLG-L, the interval flanked by and including markers SATT495 and SATT313,the interval flanked by and including markers SATT495 and SATT388, theinterval flanked by and including markers P10649C-3 and SATT182, theinterval flanked by and including markers S04867-1-A and S03859-1-A, theinterval flanked by and including markers S08110-1-Q1 and S08010-1-Q1,the interval flanked by and including markers S08117-1-Q1 andS08010-1-Q1, the interval flanked by and including markers S08110-1-Q1and S08105-1-Q1, the interval flanked by and including markersS08117-1-Q1 and S08105-1-Q1, and the interval flanked by and includingmarkers S08113-1-Q1 and S08105-1-Q1.

Initial fine mapping isolated the location of the QTL associated withherbicide tolerance/sensitivity to a ˜56 kb interval between markerS08117-1-Q1 and S08105-1-Q1 on linkage group L. Further fine mappingrefined the location of the QTL to a ˜44 kb interval between markerS08113-1-Q1 and S08105-1-Q1 on linkage group L. Accordingly, markersthat map within the interval defined by and including these markers areparticularly useful for selecting for this QTL. These markers includeS08117-1-Q1, S08119-1-Q1, S08118-1-Q1, S08116-1-Q1, S08101-1-Q1,S08112-1-Q1, S08108-1-Q1, S08101-1-Q1, S08101-2-Q1, S08101-3-Q1,S08101-4-Q1, and S08105-1-Q1. In some examples, the markers areS08112-1-Q1, S08108-1-Q1, S08101-2-Q1, S08101-3-Q1, and S08101-4-Q1.

Methods of introgressing tolerance to mesotrione and/or isoxazoleherbicides into non-tolerant or less-tolerant soybean germplasm areprovided. Any method for introgressing QTLs into soybean plants can beused. In some examples, a first soybean germplasm that containstolerance or sensitivity to mesotrione and/or isoxazole herbicidesderived from the QTL mapped to linkage group L which is associated withtolerance or sensitivity to mesotrione and/or isoxazole herbicides and asecond soybean germplasm that lacks tolerance or sensitivity tomesotrione and/or isoxazole herbicides derived from the QTL mapped tolinkage group L are provided. The first soybean plant may be crossedwith the second soybean plant to provide progeny soybeans. Phenotypicand/or marker screening is performed on the progeny plants to determinethe presence of tolerance or sensitivity to mesotrione and/or isoxazoleherbicides derived from the QTL mapped to linkage group L. Progeny thattest positive for the presence of tolerance or sensitivity to mesotrioneand/or isoxazole herbicides derived from the QTL mapped to linkage groupL can be selected.

In some examples, the screening and selection are performed by usingmarker-assisted selection using any marker or combination of markers onmajor linkage group L provided. Any method of identifying the presenceor absence of these markers may be used, including for examplesingle-strand conformation polymorphism (SSCP) analysis, base excisionsequence scanning (BESS), RFLP analysis, heteroduplex analysis,denaturing gradient gel electrophoresis, temperature gradientelectrophoresis, allelic PCR, ligase chain reaction direct sequencing,mini sequencing, nucleic acid hybridization, or micro-array-typedetection.

Amplification primers for amplifying marker loci and suitable markerprobes to detect marker loci or to genotype SNP alleles are provided,for example, in Table C and the related sequence listing (SEQ ID NOs:1-121). Optionally, other sequences to either side of the given primerscan be used in place of the given primers, so long as the primers canamplify a region that includes the allele to be detected. Further, itwill be appreciated that the precise probe to be used for detection canvary, e.g., any probe that can identify the region of a marker ampliconto be detected can be substituted for those examples provided herein.The configuration of the amplification primers and detection probes can,of course, vary. Thus, the invention is not limited to the primers andprobes specifically recited herein.

Systems, including automated systems for selecting plants that comprisea marker of interest and/or for correlating presence of the marker withtolerance are also provided. These systems can include probes relevantto marker locus detection, detectors for detecting labels on the probes,appropriate fluid handling elements and temperature controllers that mixprobes and templates and/or amplify templates, and systems and/orinstructions that correlate label detection to the presence of aparticular marker locus or allele.

Kits are also provided. For example, a kit can include appropriateprimers or probes for detecting tolerance associated marker loci andinstructions for using the primers or probes for detecting the markerloci and correlating the loci with predicted tolerance to mesotrioneand/or isoxazole herbicides. The kits can further include packagingmaterials for packaging the probes, primers, or instructions; controls,such as control amplification reactions that include probes, primers, ortemplate nucleic acids for amplifications; molecular size markers; orthe like.

Isolated nucleic acid fragments comprising a nucleic acid sequencecoding for soybean tolerance or sensitivity to mesotrione and/orisoxazole herbicides, are provided. The nucleic acid fragment comprisesat least a portion of a nucleic acid belonging to linkage group L. Thenucleic acid fragment is capable of hybridizing under stringentconditions to a nucleic acid of a soybean cultivar tolerant tomesotrione and/or isoxazole herbicides containing a QTL associated withmesotrione and/or isoxazole herbicide tolerance that is located on majorlinkage group L.

Vectors comprising such nucleic acid fragments, expression products ofsuch vectors expressed in a host compatible therewith, antibodies to theexpression product (both polyclonal and monoclonal), and antisensenucleic acid to the nucleic acid fragment are also provided.

Seed of a soybean produced by crossing a soybean variety havingmesotrione and/or isoxazole herbicide tolerance QTL located on majorlinkage group L in its genome with another soybean variety, and progenythereof, are provided.

Detection Methods

Any suitable detection method known in the art can be used to detect themarkers, QTL, or traits discussed herein. In some examples, the presenceof marker loci is directly detected in unamplified genomic DNA byperforming a Southern blot on a sample of genomic DNA using probes tothe marker loci. In other examples, amplification based techniques areemployed. PCR, RT-PCR, and LCR are in particularly broad use asamplification and amplification-detection methods for amplifying nucleicacids of interest, thus facilitating detection of markers. Proceduresfor performing Southern blotting, amplification (PCR, LCR, or the like),and many other nucleic acid detection methods are well established andare taught, e.g., in Sambrook et al., Molecular Cloning—A LaboratoryManual (3d ed.), Vol. 1-3, Cold Spring Harbor Laboratory, Cold SpringHarbor, N.Y., 2000 (“Sambrook”); Current Protocols in Molecular Biology,F. M. Ausubel et al., eds., Current Protocols, a joint venture betweenGreene Publishing Associates, Inc. and John Wiley & Sons, Inc.,(supplemented through 2002) (“Ausubel”)) and PCR Protocols A Guide toMethods and Applications (Innis et al. eds) Academic Press Inc. SanDiego, Calif. (1990) (Innis). Additional details regarding detection ofnucleic acids in plants can also be found, e.g., in Plant MolecularBiology (1993) Croy (ed.) BIOS Scientific Publishers, Inc.

Typically, molecular markers are detected by any established methodavailable, including, without limitation, allele specific hybridization(ASH), real-time PCR assays for detecting single nucleotidepolymorphisms (SNP), amplified fragment length polymorphism (AFLP)detection, amplified variable sequence detection, randomly amplifiedpolymorphic DNA (RAPD) detection, restriction fragment lengthpolymorphism (RFLP) detection, self-sustained sequence replicationdetection, simple sequence repeat (SSR) detection, single-strandconformation polymorphisms (SSCP) detection, isozyme markers detection,or the like. While the exemplary markers provided in the tables hereinare either SSR or SNP markers, any of the aforementioned marker typescan be employed to identify chromosome segments encompassing geneticelement that contribute to superior agronomic performance (e.g.,tolerance or improved tolerance).

In another example, the presence or absence of a molecular marker isdetermined by nucleotide sequencing of the polymorphic marker region.This method is readily adapted to high throughput analysis, as are theother methods noted above, e.g., using available high throughputsequencing methods such as sequencing by hybridization.

In general, the majority of genetic markers rely on one or moreproperties of nucleic acids for their detection. For example, sometechniques for detecting genetic markers utilize hybridization of aprobe nucleic acid to nucleic acids corresponding to the genetic marker(e.g., amplified nucleic acids produced using genomic soybean DNA as atemplate). Hybridization formats, including but not limited to solutionphase, solid phase, mixed phase, or in situ hybridization assays areuseful for allele detection. An extensive guide to the hybridization ofnucleic acids is found in Tijssen (1993) Laboratory Techniques inBiochemistry and Molecular Biology—Hybridization with Nucleic AcidProbes Elsevier, New York, as well as in Sambrook and Ausubel.

For example, markers that comprise restriction fragment lengthpolymorphisms (RFLP) are detected, e.g., by hybridizing a probe which istypically a sub-fragment (or a synthetic oligonucleotide correspondingto a sub-fragment) of the nucleic acid to be detected torestriction-digested genomic DNA. The restriction enzyme is selected toprovide restriction fragments of at least two alternative (orpolymorphic) lengths in different individuals or populations.Determining one or more restriction enzymes that produce informativefragments for each cross is a simple procedure. After separation bylength in an appropriate matrix (e.g., agarose, polyacrylamide, etc.)and transfer to a membrane (e.g., nitrocellulose, nylon, etc.), thelabeled probe is hybridized under conditions which result in equilibriumbinding of the probe to the target followed by removal of excess probeby washing.

In some examples, molecular markers are detected using a suitablePCR-based detection method. This includes methods where the size orsequence of the PCR amplicon is indicative of the absence or presence ofthe marker (e.g., a particular marker allele), as well as methods wherea labeled allele-specific probe is used for detection (e.g., a TaqMan®assay). In these types of methods, PCR primers and, optionally, probesare hybridized to the conserved regions flanking the polymorphic markerregion. Suitable primers can be designed using any suitable method. Itis not intended that the invention be limited to any particular primeror primer pair. For example, primers can be designed using any suitablesoftware program, such as LASERGENE®.

In some examples, primers are labeled by any suitable means (e.g., usinga non-radioactive fluorescent tag) to allow for rapid visualization ofthe different size amplicons following an amplification reaction withoutany additional labeling step or visualization step. In some examples,the primers are not labeled, and the amplicons are visualized followingtheir size resolution, e.g., following agarose gel electrophoresis. Insome examples, ethidium bromide staining of the PCR amplicons followingsize resolution allows visualization of the different size amplicons.

The primers used to amplify the marker loci and alleles herein are notlimited to amplifying the entire region of the relevant locus. In someexamples, marker amplification produces an amplicon at least 20nucleotides in length, or alternatively, at least 50 nucleotides inlength, or alternatively, at least 100 nucleotides in length, oralternatively, at least 200 nucleotides in length, or up to andincluding the full length of the amplicon.

Nucleic acid probes to the marker loci can also be cloned and/orsynthesized. Any suitable label can be used with a probe. Detectablelabels suitable for use with nucleic acid probes include, for example,any composition detectable by spectroscopic, radioisotopic,photochemical, biochemical, immunochemical, electrical, optical orchemical means. Useful labels include biotin for staining with labeledstreptavidin conjugate, magnetic beads, fluorescent dyes, radiolabels,enzymes, and colorimetric labels. Other labels include ligands, whichbind to antibodies labeled with fluorophores, chemiluminescent agents,and enzymes. A probe can also constitute radiolabelled PCR primers thatare used to generate a radiolabelled amplicon. Methods and reagents forlabeling nucleic acids and corresponding detection strategies can befound, e.g., in Haugland (1996) Handbook of Fluorescent Probes andResearch Chemicals Sixth Edition by Molecular Probes, Inc. (EugeneOreg.); or Haugland (2001) Handbook of Fluorescent Probes and ResearchChemicals Eighth Edition by Molecular Probes, Inc. (Eugene Oreg.).

Separate detection probes can also be omitted in amplification/detectionmethods, e.g., by performing a real time amplification reaction thatdetects product formation by modification of the relevant amplificationprimer upon incorporation into a product, incorporation of labelednucleotides into an amplicon, or by monitoring changes in molecularrotation properties of amplicons as compared to unamplified precursors(e.g., by fluorescence polarization).

In alternative embodiments, in silico methods can be used to detect themarker loci of interest. For example, the sequence of a nucleic acidcomprising the marker locus of interest can be stored in a computer. Thedesired marker locus sequence or its homolog can be identified using anappropriate nucleic acid search algorithm as provided by, for example,in such readily available programs as BLAST, or even simple wordprocessors.

Real Time Amplification/Detection Methods:

In one aspect, real time PCR or LCR is performed on the amplificationmixtures described herein, e.g., using molecular beacons or TaqMan™probes. A molecular beacon (MB) is an oligonucleotide or peptide nucleicacid (PNA) which, under appropriate hybridization conditions,self-hybridizes to form a stem and loop structure. The MB has a labeland a quencher at the termini of the oligonucleotide or PNA; thus, underconditions that permit intra-molecular hybridization, the label istypically quenched (or at least altered in its fluorescence) by thequencher. Under conditions where the MB does not display intra-molecularhybridization (e.g., when bound to a target nucleic acid, e.g., to aregion of an amplicon during amplification), the MB label is unquenchedand signal is detected. Standard methods of making and using MBs areknown and MBs and reagents are commercially available. See also, e.g.,Leone et al. (1995) “Molecular beacon probes combined with amplificationby NASBA enable homogenous real-time detection of RNA.” Nucleic AcidsRes. 26:2150-2155; Tyagi and Kramer (1996) “Molecular beacons: probesthat fluoresce upon hybridization” Nature Biotechnology 14:303-308; Blokand Kramer (1997) “Amplifiable hybridization probes containing amolecular switch” Mol Cell Probes 11:187-194; Hsuih et al. (1997)“Novel, ligation-dependent PCR assay for detection of hepatitis C inserum” J Clin Microbiol 34:501-507; Kostrikis et al. (1998) “Molecularbeacons: spectral genotyping of human alleles” Science 279:1228-1229;Sokol et al. (1998) “Real time detection of DNA:RNA hybridization inliving cells” Proc. Natl. Acad. Sci. U.S.A. 95:11538-11543; Tyagi et al.(1998) “Multicolor molecular beacons for allele discrimination” NatureBiotechnology 16:49-53; Bonnet et al. (1999) “Thermodynamic basis of thechemical specificity of structured DNA probes” Proc. Natl. Acad. Sci.U.S.A. 96:6171-6176; Fang et al. (1999) “Designing a novel molecularbeacon for surface-immobilized DNA hybridization studies” J. Am. Chem.Soc. 121:2921-2922; Marras et al. (1999) “Multiplex detection ofsingle-nucleotide variation using molecular beacons” Genet. Anal.Biomol. Eng. 14:151-156; and Vet et al. (1999) “Multiplex detection offour pathogenic retroviruses using molecular beacons” Proc. Natl. Acad.Sci. U.S.A. 96:6394-6399. See also, e.g., U.S. Pat. No. 5,925,517 (Jul.20, 1999) to Tyagi et al. entitled “Detectably labeled dual conformationoligonucleotide probes, assays and kits;” U.S. Pat. No. 6,150,097 toTyagi et al (Nov. 21, 2000) entitled “Nucleic acid detection probeshaving non-FRET fluorescence quenching and kits and assays includingsuch probes” and U.S. Pat. No. 6,037,130 to Tyagi et al (Mar. 14, 2000),entitled “Wavelength-shifting probes and primers and their use in assaysand kits.”

PCR detection and quantification using dual-labeled fluorogenicoligonucleotide probes can be done, using, for example, TaqMan® probes.These probes are composed of short (e.g., 10-40 bases)oligodeoxynucleotides that are labeled with two different fluorescentdyes. On the 5′ terminus of each probe is a reporter dye, and on the 3′terminus of each probe a quenching dye is found. The oligonucleotideprobe sequence is complementary to an internal target sequence presentin a PCR amplicon. When the probe is intact, energy transfer occursbetween the two fluorophores and emission from the reporter is quenchedby the quencher via FRET. During the extension phase of PCR, the probeis cleaved by 5′ nuclease activity of the polymerase used in thereaction, thereby releasing the reporter from theoligonucleotide-quencher and producing an increase in reporter emissionintensity. Accordingly, TaqMan® probes are oligonucleotides that have alabel and a quencher, where the label is released during amplificationby the exonuclease action of the polymerase used in amplification. Thisprovides a real time measure of amplification during synthesis. Avariety of TaqMan® reagents are commercially available, e.g., fromApplied Biosystems (Division Headquarters in Foster City, Calif.) aswell as from a variety of specialty vendors such as BiosearchTechnologies (e.g., black hole quencher probes).

In general, synthetic methods for making oligonucleotides, includingprobes, primers, molecular beacons, PNAs, LNAs (locked nucleic acids),etc., are well known. For example, oligonucleotides can be synthesizedchemically according to the solid phase phosphoramidite triester methoddescribed by Beaucage and Caruthers (1981), Tetrahedron Letts22:1859-1862, e.g., using a commercially available automatedsynthesizer. Oligonucleotides, including modified oligonucleotides andPNAs, can also be ordered from a variety of commercial sources known topersons of skill.

Additional Details Regarding Amplified Variable Sequences, SSR, AFLPASH, SNPs, and Isozyme Markers

Amplified variable sequences refer to amplified sequences of the plantgenome, which exhibit high nucleic acid residue variability betweenmembers of the same species. All organisms have variable genomicsequences and each organism (with the exception of a clone) has adifferent set of variable sequences. Once identified, the presence ofspecific variable sequence can be used to predict phenotypic traits.Typically, DNA from the plant serves as a template for amplificationwith primers that flank a variable sequence of DNA. The variablesequence is amplified and then sequenced.

Alternatively, self-sustained sequence replication can be used toidentify genetic markers. Self-sustained sequence replication refers toa method of nucleic acid amplification using target nucleic acidsequences which are replicated exponentially in vitro undersubstantially isothermal conditions by using three enzymatic activitiesinvolved in retroviral replication: (1) reverse transcriptase, (2) RNaseH, and (3) a DNA-dependent RNA polymerase (Guatelli et al. (1990) ProcNatl Acad Sci USA 87:1874). By mimicking the retroviral strategy of RNAreplication by means of cDNA intermediates, this reaction accumulatescDNA and RNA copies of the original target.

Amplified fragment length polymorphisms (AFLP), which are amplifiedbefore or after cleavage by a restriction endonuclease, can also be usedas genetic markers (Vos et al. (1995) Nucl Acids Res 23:4407). Theamplification step allows easier detection of specific restrictionfragments. AFLP allows the detection large numbers of polymorphicmarkers and has been used for genetic mapping of plants (Becker et al.(1995) Mol Gen Genet 249:65; and Meksem et al. (1995) Mol Gen Genet249:74).

Allele-specific hybridization (ASH) can be used to identify the geneticmarkers. ASH technology is based on the stable annealing of a short,single-stranded, oligonucleotide probe to a completely complementarysingle-strand target nucleic acid. Detection is via an isotopic ornon-isotopic label attached to the probe.

For each polymorphism, two or more different ASH probes are designed tohave identical DNA sequences except at the polymorphic nucleotides. Eachprobe will have exact homology with one allele sequence so that therange of probes can distinguish all the known alternative allelesequences. Each probe is hybridized to the target DNA. With appropriateprobe design and hybridization conditions, a single-base mismatchbetween the probe and target DNA will prevent hybridization. In thismanner, only one of the alternative probes will hybridize to a targetsample that is homozygous or homogenous for an allele. Samples that areheterozygous or heterogeneous for two alleles will hybridize to both oftwo alternative probes.

ASH markers are used as dominant markers where the presence or absenceof only one allele is determined from hybridization or lack ofhybridization by only one probe. The alternative allele may be inferredfrom the lack of hybridization. ASH probe and target molecules areoptionally RNA or DNA; the target molecules are any length ofnucleotides beyond the sequence that is complementary to the probe; theprobe is designed to hybridize with either strand of a DNA target; theprobe ranges in size to conform to variously stringent hybridizationconditions, etc.

PCR allows the target sequence for ASH to be amplified from lowconcentrations of nucleic acid in relatively small volumes. Otherwise,the target sequence from genomic DNA is digested with a restrictionendonuclease and size separated by gel electrophoresis. Hybridizationstypically occur with the target sequence bound to the surface of amembrane or, as described in U.S. Pat. No. 5,468,613, the ASH probesequence may be bound to a membrane. In one example, ASH data aretypically obtained by amplifying nucleic acid fragments (amplicons) fromgenomic DNA using PCR, transferring the amplicon target DNA to amembrane in a dot-blot format, hybridizing a labeled oligonucleotideprobe to the amplicon target, and observing the hybridization dots byautoradiography.

Single nucleotide polymorphisms (SNP) are markers that consist of ashared sequence differentiated on the basis of a single nucleotide.Typically, this distinction is detected by differential migrationpatterns of an amplicon comprising the SNP on, e.g., an acrylamide gel.However, alternative modes of detection, such as hybridization, e.g.,ASH, or RFLP analysis are also appropriate.

Isozyme markers can be employed as genetic markers, e.g., to trackmarkers other than the tolerance markers herein, or to track isozymemarkers linked to the markers herein. Isozymes are multiple forms ofenzymes that differ from one another in their amino acid sequence, andtherefore their nucleic acid sequences. Some isozymes are multimericenzymes containing slightly different subunits. Other isozymes areeither multimeric or monomeric but have been cleaved from the proenzymeat different sites in the amino acid sequence. Isozymes can becharacterized and analyzed at the protein level, or alternatively,isozymes, which differ at the nucleic acid level, can be determined. Insuch cases any of the nucleic acid based methods described herein can beused to analyze isozyme markers.

Marker Assisted Selection and Breeding of Plants

The identification of markers associated with a particular phenotypictrait can allow for selection of plants possessing that trait, forexample, via marker assisted selection (MAS). In general, theapplication of MAS uses the identification of a population of tolerantplants and genetic mapping of the tolerance trait. Polymorphic loci inthe vicinity of the mapped tolerance trait are chosen as potentialtolerance markers. Typically, a marker locus closest to the tolerancelocus is a preferred marker. Linkage analysis is then used to determinewhich polymorphic marker allele sequence demonstrates a statisticallikelihood of co-segregation with the tolerant phenotype (thus, a“tolerance marker allele”). Following identification of a marker allelefor co-segregation with the tolerance allele, it is possible to use thismarker for rapid, accurate screening of plant lines for the toleranceallele without the need to grow the plants through their life cycle andawait phenotypic evaluations, and furthermore, permits genetic selectionfor the particular tolerance allele even when the molecular identity ofthe actual tolerance QTL is anonymous. Tissue samples can be taken, forexample, from the first leaf of the plant and screened with theappropriate molecular marker, and within days it is determined whichprogeny will advance. Linked markers also remove the impact ofenvironmental factors that can often influence phenotypic expression.

After a desired phenotype (e.g., tolerance or sensitivity to mesotrioneand/or isoxazole herbicides) and a polymorphic chromosomal marker locusare determined to cosegregate, the polymorphic marker locus can be usedto select for marker alleles that segregate with the desired tolerancephenotype. This general process is typically called marker-assistedselection (MAS). In brief, a nucleic acid corresponding to the markernucleic acid is detected in a biological sample from a plant to beselected. This detection can take the form of hybridization of a probenucleic acid to a marker allele or amplicon thereof, e.g., usingallele-specific hybridization, Southern analysis, northern analysis, insitu hybridization, hybridization of primers followed by PCRamplification of a region of the marker, or the like. After the presence(or absence) of a particular marker in the biological sample isverified, the plant is selected, e.g., used to make progeny plants byselective breeding.

Soybean plant breeders desire combinations of tolerance loci with genesfor high yield and other desirable traits to develop improved soybeanvarieties. Screening large numbers of samples by non-molecular methods(e.g., trait evaluation in soybean plants) can be expensive, timeconsuming, and unreliable. Use of the polymorphic markers describedherein genetically linked to tolerance loci provide effective methodsfor selecting tolerant varieties in breeding programs. For example, oneadvantage of marker-assisted selection over field evaluations fortolerance is that MAS can be done at any time of year, regardless of thegrowing season. Moreover, environmental effects are largely irrelevantto marker-assisted selection. When a population is segregating formultiple loci affecting one or multiple traits, e.g., multiple lociinvolved in tolerance, or multiple loci each involved in tolerance ortolerance to different herbicides, the efficiency of MAS compared tophenotypic screening becomes even greater, because all of the loci canbe evaluated in the lab together from a single sample of DNA. In thepresent instance, for linkage group L, relevant markers include:SATT495, P10649C-3, SATT182, S03859-1, S00224-1, SATT388, SATT313, andSATT613 (or other markers above SATT613). Additional relevant markers onlinkage group L include S03859-1-A, S08103-1-Q1, S08104-1-Q1,S08106-1-Q1, S08110-1-Q1, S08111-1-Q1, S08115-2-Q1, S08117-1-Q1,S08119-1-Q1, S08118-1-Q1, S08116-1-Q1, S08114-1-Q1, S08113-1-Q1,S08112-1-Q1, S08108-1-Q1, S08101-2-Q1, S08101-3-Q1, S08101-4-Q1,S08105-1-Q1, S08102-1-Q1, S08107-1-Q1, S08109-1-Q1, and S08101-1-Q1, andmarkers for other traits, transgenes, and/or loci can be assayedsimultaneously or sequentially in a single sample or population ofsamples. Markers for other traits, transgenes, and/or loci can beassayed simultaneously or sequentially in a single sample or populationof samples.

Another use of MAS in plant breeding is to assist the recovery of therecurrent parent genotype by backcross breeding. Backcross breeding isthe process of crossing a progeny back to one of its parents or parentlines. Backcrossing is usually done for the purpose of introgressing oneor a few loci from a donor parent (e.g., a parent comprising desirabletolerance marker loci) into an otherwise desirable genetic backgroundfrom the recurrent parent (e.g., an otherwise high yielding soybeanline). The more cycles of backcrossing that are done, the greater thegenetic contribution of the recurrent parent to the resultingintrogressed variety. This is often necessary, because tolerant plantsmay be otherwise undesirable, e.g., due to low yield, low fecundity, orthe like. In contrast, strains which are the result of intensivebreeding programs may have excellent yield, fecundity or the like,merely being deficient in one desired trait, such as tolerance orsensitivity to mesotrione and/or isoxazole herbicides.

The determination of the presence and/or absence of a particular geneticmarker or allele, e.g., SATT495, P10649C-3, SATT182, S03859-1, S00224-1,SATT388, SATT313, SATT613 (including markers above SATT613), S03859-1-A,S08103-1-Q1, S08104-1-Q1, S08106-1-Q1, S08110-1-Q1, S08111-1-Q1,S08115-2-Q1, S08117-1-Q1, S08119-1-Q1, S08118-1-Q1, S08116-1-Q1,S08114-1-Q1, S08113-1-Q1, S08112-1-Q1, S08108-1-Q1, S08101-2-Q1,S08101-3-Q1, S08101-4-Q1, S08105-1-Q1, S08102-1-Q1, S08107-1-Q1,S08109-1-Q1, or S08101-1-Q1, in the genome of a plant exhibiting apreferred phenotypic trait can be made by any method noted herein. Ifthe nucleic acids from the plant are positive for a desired geneticmarker, the plant can be self fertilized to create a true breeding linewith the same genotype, or it can be crossed with a plant with the samemarker or with other desired characteristics to create a sexuallycrossed hybrid generation.

Introgression of Favorable Alleles—Efficient Crossing of ToleranceMarkers into Other Lines

One application of MAS is to use the tolerance or improved tolerancemarkers to increase the efficiency of an introgression or backcrossingeffort aimed at introducing a tolerance QTL into a desired (typicallyhigh yielding) background. In marker assisted backcrossing of specificmarkers (and associated QTL) from a donor source, e.g., to an elitegenetic background, one selects among progeny or backcross progeny forthe donor trait.

Thus, the markers and methods can be utilized to guide marker assistedselection or breeding of soybean varieties with the desired complement(set) of allelic forms of chromosome segments associated with herbicidetolerance as well as markers associated with superior agronomicperformance (tolerance, along with any other available markers foryield, disease tolerance, etc.). Any of the disclosed marker alleles canbe introduced into a soybean line via, for example, introgression,traditional breeding, or transformation, or a combination thereof, toyield a soybean plant with superior agronomic performance. The number ofalleles associated with mesotrione and/or isoxazole tolerance that canbe introduced or be present in a soybean plant ranges from 1 to thenumber of alleles disclosed herein, each integer of which isincorporated herein as if explicitly recited.

Methods of making a progeny soybean plant, and these progeny soybeanplants having tolerance or susceptibility to mesotrione and/orisoxazole, are provided. These methods comprise crossing a first parentsoybean plant with a second soybean plant and growing the female soybeanplant under plant growth conditions to yield soybean plant progeny. Suchsoybean plant progeny can be assayed for alleles associated withtolerance and, thereby, the desired progeny selected. Such progenyplants or seed can be sold commercially for soybean production, used forfood, processed to obtain a desired constituent of the soybean, orfurther utilized in subsequent rounds of breeding. At least one of thefirst or second soybean plants is a soybean plant comprising at leastone of the allelic forms of the markers provided, such that the progenyare capable of inheriting the allele.

Inheritance of the desired tolerance allele can be traced, such as fromprogenitor or descendant lines in the subject soybean plants pedigreesuch that the number of generations separating the soybean plants beingsubject to the methods will generally be from 1 to 20, commonly 1 to 5,and typically 1, 2, or 3 generations of separation, and quite often adirect descendant or parent of the soybean plant will be subject to themethod (i.e., 1 generation of separation).

Positional Cloning

The molecular marker loci and alleles associated with tolerance orsusceptibility to mesotrione and/or isoxazole, e.g., SATT495, P10649C-3,SATT182, S03859-1, S00224-1, SATT388, SATT313, SATT613 (includingmarkers above SATT613), S03859-1-A, S08103-1-Q1, S08104-1-Q1,S08106-1-Q1, S08110-1-Q1, S08111-1-Q1, S08115-2-Q1, S08117-1-Q1,S08119-1-Q1, S08118-1-Q1, S08116-1-Q1, S08114-1-Q1, S08113-1-Q1,S08112-1-Q1, S08108-1-Q1, S08101-2-Q1, S08101-3-Q1, S08101-4-Q1,S08105-1-Q1, S08102-1-Q1, S08107-1-Q1, S08109-1-Q1, and S08101-1-Q1, canbe used, as indicated previously, to identify a tolerance QTL, which canbe cloned by well-established procedures, e.g., as described in detailin Ausubel, Berger and Sambrook.

These tolerance clones are first identified by their genetic linkage tomarkers provided herein. Isolation of a nucleic acid of interest isachieved by any number of methods as discussed in detail in suchreferences as Ausubel, Berger and Sambrook, herein, and Clark, ed.(1997) Plant Molecular Biology: A Laboratory Manual Springer-Verlag,Berlin.

For example, “positional gene cloning” uses the proximity of a tolerancemarker to physically define an isolated chromosomal fragment containinga tolerance QTL gene. The isolated chromosomal fragment can be producedby such well known methods as digesting chromosomal DNA with one or morerestriction enzymes, or by amplifying a chromosomal region in apolymerase chain reaction (PCR), or any suitable alternativeamplification reaction. The digested or amplified fragment is typicallyligated into a vector suitable for replication, and, e.g., expression,of the inserted fragment. Markers that are adjacent to an open readingframe (ORF) associated with a phenotypic trait can hybridize to a DNAclone (e.g., a clone from a genomic DNA library), thereby identifying aclone on which an ORF (or a fragment of an ORF) is located. If themarker is more distant, a fragment containing the open reading frame isidentified by successive rounds of screening and isolation of cloneswhich together comprise a contiguous sequence of DNA, a process termed“chromosome walking”, resulting in a “contig” or “contig map.” Protocolssufficient to guide one of skill through the isolation of clonesassociated with linked markers are found in, e.g. Berger, Sambrook andAusubel, all herein.

Variant sequences have a high degree of sequence similarity. Forpolynucleotides, conservative variants include those sequences that,because of the degeneracy of the genetic code, encode the amino acidsequence of one of the native recombinase polypeptides. Variants such asthese can be identified with the use of well-known molecular biologytechniques, as, for example, with polymerase chain reaction (PCR) andhybridization techniques. Variant polynucleotides also includesynthetically derived nucleotide sequences, such as those generated, forexample, by using site-directed mutagenesis but which still encode arecombinase protein. Generally, variants of a particular polynucleotidewill have at least about 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%,85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99% or more sequenceidentity to that particular polynucleotide as determined by knownsequence alignment programs and parameters.

Variants of a particular polynucleotide (the reference nucleotidesequence) can also be evaluated by comparison of the percent sequenceidentity between the polypeptide encoded by a variant polynucleotide andthe polypeptide encoded by the reference polynucleotide. Percentsequence identity between any two polypeptides can be calculated usingsequence alignment programs and parameters described. Where any givenpair of polynucleotides is evaluated by comparison of the percentsequence identity shared by the two polypeptides they encode, thepercent sequence identity between the two encoded polypeptides is atleast about 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%,92%, 93%, 94%, 95%, 96%, 97%, 98%, 99% or more sequence identity.

Variant proteins include proteins derived from the native protein bydeletion, addition, and/or substitution of one or more amino acids tothe N-terminal, internal region(s), and/or C-terminal end of the nativeprotein. Variant proteins can be biologically active, that is theycontinue to possess the desired biological activity of the nativeprotein, for example a variant recombinase can implement a recombinationevent between appropriate recombination sites. Such variants may resultfrom, for example, genetic polymorphism or from human manipulation. Abiologically active variant of a protein may differ from that protein byas few as 1-15 amino acid residues, as few as 1-10, such as 6-10, as fewas 5, as few as 4, 3, 2, or even 1 amino acid residue.

Sequence relationships can be analyzed and described usingcomputer-implemented algorithms. The sequence relationship between twoor more polynucleotides or two or more polypeptides can be determined bygenerating the best alignment of the sequences, and scoring the matchesand the gaps in the alignment, which yields the percent sequenceidentity, and the percent sequence similarity. Polynucleotiderelationships can also be described based on a comparison of thepolypeptide each encodes. Many programs and algorithms for thecomparison and analysis of sequences are available.

Unless otherwise stated, sequence identity/similarity values providedherein refer to the value obtained using GAP Version 10 (GCG, Accelrys,San Diego, Calif.) using the following parameters: % identity and %similarity for a nucleotide sequence using a gap creation penalty weightof 50 and a gap length extension penalty weight of 3, and thenwsgapdna.cmp scoring matrix; % identity and % similarity for an aminoacid sequence using a GAP creation penalty weight of 8 and a gap lengthextension penalty of 2, and the BLOSUM62 scoring matrix (Henikoff &Henikoff (1989) Proc Natl Acad Sci USA 89:10915).

GAP uses the algorithm of Needleman & Wunsch (1970) J Mol Biol48:443-453, to find an alignment of two complete sequences thatmaximizes the number of matches and minimizes the number of gaps. GAPconsiders all possible alignments and gap positions and creates thealignment with the largest number of matched bases and the fewest gaps.It allows for the provision of a gap creation penalty and a gapextension penalty in units of matched bases. GAP must make a profit ofgap creation penalty number of matches for each gap it inserts. If a gapextension penalty greater than zero is chosen, GAP must, in addition,make a profit for each gap inserted of the length of the gap times thegap extension penalty. GAP presents one member of the family of bestalignments.

Sequence identity, or identity, is a measure of the residues in the twosequences that are the same when aligned for maximum correspondence.Sequences, particularly polypeptides, that differ by conservativesubstitutions are said to have sequence similarity or similarity. Meansfor making this adjustment are known, and typically involve scoring aconservative substitution as a partial rather than a full mismatch. Forexample, where an identical amino acid is given a score of 1 and anon-conservative substitution is given a score of zero, a conservativesubstitution is given a score between zero and 1. The scoring ofconservative substitutions is calculated using the selected scoringmatrix (BLOSUM62 by default for GAP).

Equivalent positions between two or more polynucleotides, and/orpolypeptides can be identified using any searching, sequence assembly,and/or alignment tool including, but not limited to, BLAST, GAP, PILEUP,FrameAlign, Sequencher, or similar tools. In some examples, GAPalignment can be used to identify equivalent positions, using thefollowing parameters: for a nucleotide sequence using a gap creationpenalty weight of 50 and a gap length extension penalty weight of 3, andthe nwsgapdna.cmp scoring matrix; for an amino acid sequence using a gapcreation penalty weight of 8 and a gap length extension penalty of 2,and the BLOSUM62 scoring matrix (Henikoff & Henikoff (1989) Proc NatlAcad Sci USA 89:10915). In some examples, PILEUP can be used to identifyequivalent positions, using the following parameters for a nucleotidesequence: a gap weight of 5 and a gap length weight of 1, and thepileupdna.cmp scoring matrix; for an amino acid sequence using a gapweight of 8 and a gap length weight of 2, and the BLOSUM62 scoringmatrix (Henikoff & Henikoff (1989) Proc Natl Acad Sci USA 89:10915).

Proteins may be altered in various ways including amino acidsubstitutions, deletions, truncations, and insertions. Methods for suchmanipulations are generally known. Methods for mutagenesis andnucleotide sequence alterations are described, for example, in Kunkel(1985) Proc Natl Acad Sci USA 82:488-492; Kunkel et al. (1987) Methodsin Enzymol 154:367-382; U.S. Pat. No. 4,873,192; Walker & Gaastra, eds.(1983) Techniques in Molecular Biology (MacMillan Publishing Company,New York) and the references cited therein. Guidance as to appropriateamino acid substitutions that do not affect biological activity of theprotein of interest may be found in the model of Dayhoff et al. (1978)Atlas of Protein Sequence and Structure (Natl Biomed Res Found,Washington, D.C.). Conservative substitutions, such as exchanging oneamino acid with another having similar properties, may be preferable.

Generation of Transgenic Cells and Plants

The present invention also relates to host cells and organisms which aretransformed with nucleic acids corresponding to the tolerance, improvedtolerance, or susceptibility/sensitivity markers, traits, or QTLsidentified herein. For example, such nucleic acids include chromosomeintervals (e.g., genomic fragments), ORFs, and/or cDNAs that encode atolerance or improved tolerance trait. Additionally, production ofpolypeptides that provide tolerance or improved tolerance by recombinanttechniques are provided.

General texts which describe molecular biological techniques for thecloning and manipulation of nucleic acids and production of encodedpolypeptides include Berger and Kimmel, Guide to Molecular CloningTechniques, Methods in Enzymology volume 152 Academic Press, Inc., SanDiego, Calif. (Berger); Sambrook et al., Molecular Cloning—A LaboratoryManual (3rd Ed.), Vol. 1-3, Cold Spring Harbor Laboratory, Cold SpringHarbor, N.Y., 2001 (“Sambrook”) and Current Protocols in MolecularBiology, F. M. Ausubel et al., eds., Current Protocols, a joint venturebetween Greene Publishing Associates, Inc. and John Wiley & Sons, Inc.,(supplemented through 2004 or later) (“Ausubel”)). These texts describemutagenesis, the use of vectors, promoters and many other relevanttopics related to, e.g., the generation of clones that comprise nucleicacids of interest, e.g., marker loci, marker probes, QTL that segregatewith marker loci, etc.

Host cells are genetically engineered (e.g., transduced, transfected,transformed, etc.) with the vectors (e.g., vectors, such as expressionvectors which comprise an ORF derived from or related to a toleranceQTL) which can be, for example, a cloning vector, a shuttle vector, oran expression vector. Such vectors are, for example, in the form of aplasmid, a phagemid, an agrobacterium, a virus, a naked polynucleotide(linear or circular), or a conjugated polynucleotide. Vectors can beintroduced into bacteria, especially for the purpose of propagation andexpansion. The vectors are also introduced into plant tissues, culturedplant cells, or plant protoplasts by a variety of standard methods knownin the art, including but not limited to electroporation (From et al.(1985) Proc. Natl. Acad. Sci. USA 82; 5824), infection by viral vectorssuch as cauliflower mosaic virus (CaMV) (Hohn et al. (1982) MolecularBiology of Plant Tumors (Academic Press, New York, pp. 549-560; HowellU.S. Pat. No. 4,407,956), high velocity ballistic penetration by smallparticles with the nucleic acid either within the matrix of small beadsor particles or on the surface (Klein et al. (1987) Nature 327; 70), useof pollen as vector (WO 85/01856), or use of Agrobacterium tumefaciensor A. rhizogenes carrying a T-DNA plasmid in which DNA fragments arecloned. The T-DNA plasmid is transmitted to plant cells upon infectionby Agrobacterium tumefaciens, and a portion is stably integrated intothe plant genome (Horsch et al. (1984) Science 233:496; Fraley et al.(1983) Proc. Natl. Acad. Sci. USA 80:4803). Additional details regardingnucleic acid introduction methods are found in Sambrook, Berger andAusubel. The method of introducing a nucleic acid into a host cell isnot critical, and therefore should not be limited to any particularmethod for introducing exogenous genetic material into a host cell.Thus, any suitable method that provides for effective introduction of anucleic acid into a cell or protoplast can be employed.

The engineered host cells can be cultured in conventional nutrient mediamodified as appropriate for such activities as, for example, activatingpromoters or selecting transformants. These cells can optionally becultured into transgenic plants. In addition to Sambrook, Berger andAusubel, Plant regeneration from cultured protoplasts is described inEvans et al. (1983) “Protoplast Isolation and Culture,” Handbook ofPlant Cell Cultures 1, 124-176 (MacMillan Publishing Co., New York;Davey (1983) “Recent Developments in the Culture and Regeneration ofPlant Protoplasts,” Protoplasts, pp. 12-29, (Birkhauser, Basel); Dale(1983) “Protoplast Culture and Plant Regeneration of Cereals and OtherRecalcitrant Crops,” Protoplasts pp. 31-41, (Birkhauser, Basel); Binding(1985) “Regeneration of Plants,” Plant Protoplasts, pp. 21-73, (CRCPress, Boca Raton, Fla.). Additional details regarding plant cellculture and regeneration include Payne et al. (1992) Plant Cell andTissue Culture in Liquid Systems John Wiley & Sons, Inc. New York, N.Y.;Gamborg and Phillips (eds) (1995) Plant Cell, Tissue and Organ Culture;Fundamental Methods Springer Lab Manual, Springer-Verlag (BerlinHeidelberg N.Y.) and Plant Molecular Biology (1993) R. R. D. Croy, Ed.Bios Scientific Publishers, Oxford, U.K. ISBN 0 12 198370 6. Cellculture media in general are also set forth in Atlas and Parks (eds),The Handbook of Microbiological Media (1993) CRC Press, Boca Raton, Fla.Additional information for cell culture is found in available commercialliterature such as the Life Science Research Cell Culture Catalogue(1998) from Sigma-Aldrich, Inc (St Louis, Mo.) (“Sigma-LSRCCC”) and thePlant Culture Catalogue and supplement (e.g., 1997 or later), also fromSigma-Aldrich, Inc (St Louis, Mo.) (“Sigma-PCCS”).

The production of transgenic organisms is provided, which may bebacteria, yeast, fungi, animals or plants, transduced with the nucleicacids (e.g., nucleic acids comprising the marker loci and/or QTL notedherein). A thorough discussion of techniques relevant to bacteria,unicellular eukaryotes, and cell culture is found in referencesenumerated herein. Several well-known methods of introducing targetnucleic acids into bacterial cells are available, any of which may beused. These include: fusion of the recipient cells with bacterialprotoplasts containing the DNA, treatment of the cells with liposomescontaining the DNA, electroporation, microinjection, cell fusions,projectile bombardment (biolistics), carbon fiber delivery, andinfection with viral vectors (discussed further, below). Bacterial cellscan be used to amplify the number of plasmids containing DNA constructs.The bacteria are grown to log phase and the plasmids within the bacteriacan be isolated by a variety of methods known in the art (see, forinstance, Sambrook). In addition, a plethora of kits are commerciallyavailable for the purification of plasmids from bacteria. For theirproper use, follow the manufacturer's instructions (see, for example,EasyPrep™, FlexiPrep™, both from Pharmacia Biotech; StrataClean™, fromStratagene; and, QIAprep™ from Qiagen). The isolated and purifiedplasmids are then further manipulated to produce other plasmids, used totransfect plant cells or incorporated into Agrobacterium tumefaciensrelated vectors to infect plants. Typical vectors contain transcriptionand translation terminators, transcription and translation initiationsequences, and promoters useful for regulation of the expression of theparticular target nucleic acid. The vectors optionally comprise genericexpression cassettes containing at least one independent terminatorsequence, sequences permitting replication of the cassette ineukaryotes, or prokaryotes, or both, (e.g., shuttle vectors), andselection markers for both prokaryotic and eukaryotic systems. Vectorsare suitable for replication and integration in prokaryotes, eukaryotes,or both. See, Giliman & Smith (1979) Gene 8:81; Roberts et al. (1987)Nature 328:731; Schneider et al. (1995) Protein Expr. Purif. 6435:10;Ausubel, Sambrook, Berger (all infra). A catalogue of bacteria andbacteriophages useful for cloning are well known in the art, e.g., TheATCC Catalogue of Bacteria and Bacteriophage (1992) Gherna et al. (eds),published by the ATCC.

Polynucleotide Constructs:

In specific embodiments, one or more of the herbicide-tolerantpolynucleotides employed in the methods and compositions can be providedin an expression cassette for expression in the plant or other organismof interest. The cassette will include 5′ and 3′ regulatory sequencesoperably linked to an herbicide-tolerance polynucleotide. “Operablylinked” is intended to mean a functional linkage between two or moreelements. For example, an operable linkage between a polynucleotide ofinterest and a regulatory sequence (e.g., a promoter) is functional linkthat allows for expression of the polynucleotide of interest. Operablylinked elements may be contiguous or non-contiguous. When used to referto the joining of two protein coding regions, by “operably linked” isintended that the coding regions are in the same reading frame. Whenused to refer to the effect of an enhancer, “operably linked” indicatesthat the enhancer increases the expression of a particularpolynucleotide or polynucleotides of interest. Where the polynucleotideor polynucleotides of interest encode a polypeptide, the encodedpolypeptide is produced at a higher level.

The cassette may additionally contain at least one additional gene to beco-transformed into the organism. Alternatively, the additional gene(s)can be provided on multiple expression cassettes. Such an expressioncassette is provided with a plurality of restriction sites and/orrecombination sites for insertion of the herbicide-tolerancepolynucleotide to be under the transcriptional regulation of theregulatory regions. The expression cassette may additionally containother genes, including other selectable marker genes. Where a cassettecontains more than one polynucleotide, the polynucleotides in thecassette may be transcribed in the same direction or in differentdirections (also called “divergent” transcription).

An expression cassette comprising an herbicide-tolerance polynucleotidewill include, in the 5′-3′ direction of transcription, a transcriptionaland translational initiation region (i.e., a promoter), anherbicide-tolerance polynucleotide, and a transcriptional andtranslational termination region (i.e., termination region) functionalin plants or the other organism of interest. Accordingly, plants havingsuch expression cassettes are also provided. The regulatory regions(i.e., promoters, transcriptional regulatory regions, and translationaltermination regions) and/or the herbicide-tolerance polynucleotide maybe native (i.e., analogous) to the host cell or to each other.Alternatively, the regulatory regions and/or the herbicide-tolerancepolynucleotide may be heterologous to the host cell or to each other.

While it may be optimal to express polynucleotides using heterologouspromoters, native promoter sequences may be used. Such constructs canchange expression levels and/or expression patterns of the encodedpolypeptide in the plant or plant cell. Expression levels and/orexpression patterns of the encoded polypeptide may also be changed as aresult of an additional regulatory element that is part of theconstruct, such as, for example, an enhancer. Thus, the phenotype of theplant or cell can be altered even though a native promoter is used.

The termination region may be native with the transcriptional initiationregion, may be native with the operably linked herbicide-tolerancepolynucleotide of interest, may be native with the plant host, or may bederived from another source (i.e., foreign or heterologous) to thepromoter, the herbicide-tolerance polynucleotide of interest, the planthost, or any combination thereof. Convenient termination regions areavailable from the Ti-plasmid of A. tumefaciens, such as the octopinesynthase and nopaline synthase termination regions, or can be obtainedfrom plant genes such as the Solanum tuberosum proteinase inhibitor IIgene. See Guerineau et al. (1991) Mol. Gen. Genet. 262: 141-144;Proudfoot (1991) Cell 64: 671-674; Sanfacon et al. (1991) Genes Dev. 5:141-149; Mogen et al. (1990) Plant Cell 2: 1261-1272; Munroe et al.(1990) Gene 91: 151-158; Ballas et al. (1989) Nucleic Acids Res. 17:7891-7903; and Joshi et al. (1987) Nucleic Acids Res. 15: 9627-9639.

A number of promoters can be used, including the native promoter of thepolynucleotide sequence of interest. The promoters can be selected basedon the desired outcome. The polynucleotides of interest can be combinedwith constitutive, tissue-preferred, or other promoters for expressionin plants.

Such constitutive promoters include, for example, the core promoter ofthe Rsyn7 promoter and other constitutive promoters disclosed in WO99/43838 and U.S. Pat. No. 6,072,050; the core CaMV 35S promoter (Odellet al. (1985) Nature 313:810-812); rice actin (McElroy et al. (1990)Plant Cell 2:163-171); the maize actin promoter; the ubiquitin promoter(see, e.g., Christensen et al. (1989) Plant Mol. Biol. 12:619-632;Christensen et al. (1992) Plant Mol. Biol. 18:675-689; Callis et al.(1995) Genetics 139:921-39); pEMU (Last et al. (1991) Theor. Appl.Genet. 81:581-588); MAS (Velten et al. (1984) EMBO J. 3: 2723-2730); ALSpromoter (U.S. Pat. No. 5,659,026), and the like. Other constitutivepromoters include, for example, those described in U.S. Pat. Nos.5,608,149; 5,608,144; 5,604,121; 5,569,597; 5,466,785; 5,399,680;5,268,463; 5,608,142; and 6,177,611. Some promoters show improvedexpression when they are used in conjunction with a native 5′untranslated region and/or other elements such as, for example, anintron. For example, the maize ubiquitin promoter is often placedupstream of a polynucleotide of interest along with at least a portionof the 5′ untranslated region of the ubiquitin gene, including the firstintron of the maize ubiquitin gene.

Chemical-regulated promoters can be used to modulate the expression of agene in a plant through the application of an exogenous chemicalregulator. Depending upon the objective, the promoter may be achemical-inducible promoter for which application of the chemicalinduces gene expression or the promoter may be a chemical-repressiblepromoter for which application of the chemical represses geneexpression. Chemical-inducible promoters are known in the art andinclude, but are not limited to, the maize In2-2 promoter, which isactivated by benzenesulfonamide herbicide safeners, the maize GSTpromoter, which is activated by hydrophobic electrophilic compounds thatare used as pre-emergent herbicides, and the tobacco PR-1a promoter,which is activated by salicylic acid. Other chemical-regulated promotersof interest include steroid-responsive promoters (see, e.g., theglucocorticoid-inducible promoter in Schena et al. (1991) Proc. Natl.Acad. Sci. USA 88:10421-10425 and McNellis et al. (1998) Plant J.14:247-257) and tetracycline-inducible and tetracycline-repressiblepromoters (see, e.g., Gatz et al. (1991) Mol. Gen. Genet. 227:229-237,and U.S. Pat. Nos. 5,814,618 and 5,789,156), herein incorporated byreference.

Tissue-preferred promoters can be utilized to target enhancedherbicide-tolerance polypeptide expression within a particular planttissue. Tissue-preferred promoters include Yamamoto et al. (1997) PlantJ. 12:255-265; Kawamata et al. (1997) Plant Cell Physiol. 38:792-803;Hansen et al. (1997) Mol. Gen Genet. 254:337-343; Russell et al. (1997)Transgenic Res. 6:157-168; Rinehart et al. (1996) Plant Physiol.112:1331-1341; Van Camp et al. (1996) Plant Physiol. 112:525-535;Canevascini et al. (1996) Plant Physiol. 112:513-524; Yamamoto et al.(1994) Plant Cell Physiol. 35:773-778; Lam (1994) Results Probl. CellDiffer. 20:181-196; Orozco et al. (1993) Plant Mol Biol. 23:1129-1138;Matsuoka et al. (1993) Proc Natl. Acad. Sci. USA 90:9586-9590; andGuevara-Garcia et al. (1993) Plant J. 4:495-505. Such promoters can bemodified, if necessary, for weak expression.

Leaf-preferred promoters are known in the art. See, e.g., Yamamoto etal. (1997) Plant J. 12:255-265; Kwon et al. (1994) Plant Physiol.105:357-67; Yamamoto et al. (1994) Plant Cell Physiol. 35:773-778; Gotoret al. (1993) Plant J. 3:509-18; Orozco et al. (1993) Plant Mol. Biol.23:1129-1138; and Matsuoka et al. (1993) Proc. Natl. Acad. Sci. USA90(20):9586-9590.

Root-preferred promoters are known and can be selected from the manyavailable from the literature or isolated de novo from variouscompatible species. See, e.g., Hire et al. (1992) Plant Mol. Biol.20:207-218 (soybean root-specific glutamine synthetase gene); Keller andBaumgartner (1991) Plant Cell 3:1051-1061 (root-specific control elementin the GRP 1.8 gene of French bean); Sanger et al. (1990) Plant Mol.Biol. 14(3):433-443 (root-specific promoter of the mannopine synthase(MAS) gene of Agrobacterium tumefaciens); and Miao et al. (1991) PlantCell 3:11-22 (full-length cDNA clone encoding cytosolic glutaminesynthetase (GS), which is expressed in roots and root nodules ofsoybean). See also Bogusz et al. (1990) Plant Cell 2(7): 633-641, wheretwo root-specific promoters are described. Leach and Aoyagi (1991)describe their analysis of the promoters of the highly expressed rolCand rolD root-inducing genes of Agrobacterium rhizogenes (see PlantScience (Limerick) 79:69-76). They concluded that enhancer andtissue-preferred DNA determinants are dissociated in those promoters.Teeri et al. (1989) used gene fusion to lacZ to show that theAgrobacterium T-DNA gene encoding octopine synthase is especially activein the epidermis of the root tip and that the TR2′ gene is root specificin the intact plant and stimulated by wounding in leaf tissue, anespecially desirable combination of characteristics for use with aninsecticidal or larvicidal gene (see EMBO J. 8:343-350). The TR1′ gene,fused to nptII (neomycin phosphotransferase II) showed similarcharacteristics. Additional root-preferred promoters include theVfENOD-GRP3 gene promoter (Kuster et al. (1995) Plant Mol. Biol.29:759-772); and rolB promoter (Capana et al. (1994) Plant Mol. Biol.25:681-691. See also U.S. Pat. Nos. 5,837,876; 5,750,386; 5,633,363;5,459,252; 5,401,836; 5,110,732; and 5,023,179.

Seed-preferred promoters include both seed-specific promoters (thosepromoters active during seed development such as promoters of seedstorage proteins) as well as seed-germinating promoters (those promotersactive during seed germination). See Thompson et al. (1989) BioEssays10:108, herein incorporated by reference. Such seed-preferred promotersinclude, but are not limited to, Cim1 (cytokinin-induced message);cZ19B1 (maize 19 kDa zein); milps (myo-inositol-1-phosphate synthase)(see WO 00/11177 and U.S. Pat. No. 6,225,529; herein incorporated byreference). Gamma-zein is an endosperm-specific promoter. Globulin 1(Glb-1) is a representative embryo-specific promoter. For dicots,seed-specific promoters include, but are not limited to, beanβ-phaseolin, napin, β-conglycinin, soybean lectin, cruciferin, and thelike. For monocots, seed-specific promoters include, but are not limitedto, maize 15 kDa zein, 22 kDa zein, 27 kDa zein, gamma-zein, waxy,shrunken 1, shrunken 2, globulin 1, etc. See also WO 00/12733, whereseed-preferred promoters from end1 and end2 genes are disclosed; hereinincorporated by reference.

Additional promoters of interest include the SCP1 promoter (U.S. Pat.No. 6,072,050), the HB2 promoter (U.S. Pat. No. 6,177,611) and the SAMSpromoter (US20030226166 and SEQ ID NO: 87 and biologically activevariants and fragments thereof); each of which is herein incorporated byreference. In addition, as discussed elsewhere herein, various enhancerscan be used with these promoters including, for example, the ubiquitinintron (i.e., the maize ubiquitin intron 1 (see, e.g., NCBI sequenceS94464), the omega enhancer or the omega prime enhancer (Gallie et al.(1989) Molecular Biology of RNA ed. Cech (Liss, N.Y.) 237-256 and Gallieet al. Gene (1987) 60:217-25), or the 35S enhancer; each of which isincorporated by reference.

The expression cassette can also comprise a selectable marker gene forthe selection of transformed cells. Selectable marker genes are utilizedfor the selection of transformed cells or tissues. Marker genes includegenes encoding antibiotic resistance, such as those encoding neomycinphosphotransferase II (NEO) and hygromycin phosphotransferase (HPT), aswell as genes conferring resistance to herbicidal compounds, such asglufosinate ammonium, bromoxynil, imidazolinones, and2,4-dichlorophenoxyacetate (2,4-D). Additional selectable markersinclude phenotypic markers such as beta-galactosidase and fluorescentproteins such as green fluorescent protein (GFP) (Su et al. (2004)Biotechnol Bioeng 85:610-9 and Fetter et al. (2004) Plant Cell16:215-28), cyan florescent protein (CYP) (Bolte et al. (2004) J. CellScience 117:943-54 and Kato et al. (2002) Plant Physiol 129:913-42), andyellow fluorescent protein (PhiYFP from Evrogen, see, Bolte et al.(2004) J. Cell Science 117:943-54). For additional selectable markers,see generally Yarranton (1992) Curr. Opin. Biotech. 3:506-511;Christopherson et al. (1992) Proc. Natl. Acad. Sci. USA 89:6314-6318;Yao et al. (1992) Cell 71:63-72; Reznikoff (1992) Mol. Microbiol.6:2419-2422; Barkley et al. (1980) in The Operon, pp. 177-220; Hu et al.(1987) Cell 48:555-566; Brown et al. (1987) Cell 49:603-612; Figge etal. (1988) Cell 52:713-722; Deuschle et al. (1989) Proc. Natl. Acad.Aci. USA 86:5400-5404; Fuerst et al. (1989) Proc. Natl. Acad. Sci. USA86:2549-2553; Deuschle et al. (1990) Science 248:480-483; Gossen (1993)Ph.D. Thesis, University of Heidelberg; Reines et al. (1993) Proc. Natl.Acad. Sci. USA 90:1917-1921; Labow et al. (1990) Mol. Cell. Biol.10:3343-3356; Zambretti et al. (1992) Proc. Natl. Acad. Sci. USA89:3952-3956; Bairn et al. (1991) Proc. Natl. Acad. Sci. USA88:5072-5076; Wyborski et al. (1991) Nucleic Acids Res. 19:4647-4653;Hillenand-Wissman (1989) Topics Mol. Struc. Biol. 10:143-162; Degenkolbet al. (1991) Antimicrob. Agents Chemother. 35:1591-1595; Kleinschnidtet al. (1988) Biochemistry 27:1094-1104; Bonin (1993) Ph.D. Thesis,University of Heidelberg; Gossen et al. (1992) Proc. Natl. Acad. Sci.USA 89:5547-5551; Oliva et al. (1992) Antimicrob. Agents Chemother.36:913-919; Hlavka et al. (1985) Handbook of Experimental Pharmacology,Vol. 78 (Springer-Verlag, Berlin); Gill et al. (1988) Nature334:721-724. Such disclosures are herein incorporated by reference. Theabove list of selectable marker genes is not meant to be limiting. Anyselectable marker gene can be used, including the GAT gene and/or HRAgene.

Methods are known in the art of increasing the expression level of apolypeptide in a plant or plant cell, for example, by inserting into thepolypeptide coding sequence one or two G/C-rich codons (such as GCG orGCT) immediately adjacent to and downstream of the initiating methionineATG codon. Where appropriate, the polynucleotides may be modified forincreased expression in the transformed plant. That is, thepolynucleotides can be synthesized substituting in the polypeptidecoding sequence one or more codons which are less frequently utilized inplants for codons encoding the same amino acid(s) which are morefrequently utilized in plants, and introducing the modified codingsequence into a plant or plant cell and expressing the modified codingsequence. See, e.g., Campbell and Gowri (1990) Plant Physiol. 92:1-11for a discussion of host-preferred codon usage. Methods are available inthe art for synthesizing plant-preferred genes. See, e.g., U.S. Pat.Nos. 5,380,831, and 5,436,391, and Murray et al. (1989) Nucleic AcidsRes. 17:477-498, herein incorporated by reference. Embodimentscomprising such modifications are also a feature disclosed.

Additional sequence modifications are known to enhance gene expressionin a cellular host. These include elimination of sequences encodingspurious polyadenylation signals, exon-intron splice site signals,transposon-like repeats, and other such well-characterized sequencesthat may be deleterious to gene expression. The G-C content of thesequence may be adjusted to levels average for a given cellular host, ascalculated by reference to known genes expressed in the host cell. Whenpossible, the sequence is modified to avoid predicted hairpin secondarymRNA structures. Enhancers such as the CaMV 35S enhancer may also beused (see, e.g., Benfey et al. (1990) EMBO J. 9:1685-96), or otherenhancers may be used. For example, the sequence set forth in SEQ ID NO:1, 72, 79, 84, 85, 88, or 89 or a biologically active variant orfragment thereof can be used. See also published applicationUS2007/0061917. As used herein, an enhancer, when operably linked to anappropriate promoter, will modulate the level of transcription of anoperably linked polynucleotide of interest. Biologically activefragments and variants of the enhancer domain may retain the biologicalactivity of modulating (increase or decrease) the level of transcriptionwhen operably linked to an appropriate promoter. Generally, variants ofa particular polynucleotides will have at least about 40%, 45%, 50%,55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%,97%, 98%, 99% or more sequence identity to another polynucleotides asdetermined by sequence alignment programs and parameters. Variants of aparticular polynucleotides also include those encoding a polypeptidehaving at least about 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%,90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99% or more sequenceidentity to a reference polypeptide as determined by sequence alignmentprograms and parameters. Polypeptide variants include those encoded byvariant polynucleotides, and those having at least about 40%, 45%, 50%,55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%,97%, 98%, 99% or more sequence identity to a reference polypeptide asdetermined by sequence alignment programs and parameters.

It is also recognized that the level and/or activity of a polypeptide ofinterest may be modulated by employing a polynucleotide that is notcapable of directing, in a transformed plant, the expression of aprotein or an RNA. For example, the polynucleotides may be used todesign polynucleotide constructs that can be employed in methods foraltering or mutating a genomic nucleotide sequence in an organism. Suchpolynucleotide constructs include, but are not limited to, RNA:DNAvectors, RNA:DNA mutational vectors, RNA:DNA repair vectors,mixed-duplex oligonucleotides, self-complementary RNA:DNAoligonucleotides, and recombinogenic oligonucleobases. Such nucleotideconstructs and methods of use are known in the art. See, U.S. Pat. Nos.5,565,350; 5,731,181; 5,756,325; 5,760,012; 5,795,972; and 5,871,984;all of which are herein incorporated by reference. See also, WO98/49350, WO 99/07865, WO 99/25821, and Beetham et al. (1999) Proc.Natl. Acad. Sci. USA 96: 8774-8778; herein incorporated by reference.

The expression cassette may additionally contain 5′ leader sequences.Such leader sequences can act to enhance translation. Translationleaders are known in the art and include: picornavirus leaders, forexample, EMCV leader (Encephalomyocarditis 5′ noncoding region)(Elroy-Stein et al. (1989) Proc. Natl. Acad. Sci. USA 86: 6126-6130);potyvirus leaders, for example, TEV leader (Tobacco Etch Virus) (Gallieet al. (1995) Gene 165(2): 233-238), MDMV leader (Maize Dwarf MosaicVirus) (Kong et al. (1988) Arch Virol 143:1791-1799), and humanimmunoglobulin heavy-chain binding protein (BiP) (Macejak et al. (1991)Nature 353: 90-94); untranslated leader from the coat protein mRNA ofalfalfa mosaic virus (AMV RNA 4) (Jobling et al. (1987) Nature 325:622-625); tobacco mosaic virus leader (TMV) (Gallie et al. (1989) inMolecular Biology of RNA, ed. Cech (Liss, N.Y.), pp. 237-256); and maizechlorotic mottle virus leader (MCMV) (Lommel et al. (1991) Virology 81:382-385). See also, Della-Cioppa et al. (1987) Plant Physiol. 84:965-968.

In preparing the expression cassette, the various polynucleotidefragments may be manipulated, so as to provide for sequences to be inthe proper orientation and, as appropriate, in the proper reading frame.Toward this end, adapters or linkers may be employed to join thefragments or other manipulations may be involved to provide forconvenient restriction sites, removal of superfluous material such asthe removal of restriction sites, or the like. For this purpose, invitro mutagenesis, primer repair, restriction, annealing,resubstitutions, e.g., transitions and transversions, may be involved.Standard recombinant DNA and molecular cloning techniques used hereinare well known in the art and are described more fully, for example, inSambrook et al. (1989) Molecular Cloning: A Laboratory Manual (ColdSpring Harbor Laboratory Press, Cold Spring Harbor) (also known as“Maniatis”).

In some embodiments, the polynucleotide of interest is targeted to thechloroplast for expression. In this manner, where the polynucleotide ofinterest is not directly inserted into the chloroplast, the expressioncassette will additionally contain a nucleic acid encoding a transitpeptide to direct the gene product of interest to the chloroplasts. Suchtransit peptides are known in the art. See, e.g., Von Heijne et al.(1991) Plant Mol. Biol. Rep. 9: 104-126; Clark et al. (1989) J. Biol.Chem. 264: 17544-17550; Della-Cioppa et al. (1987) Plant Physiol. 84:965-968; Romer et al. (1993) Biochem. Biophys. Res. Comm. 196:1414-1421; and Shah et al. (1986) Science 233: 478-481.

Chloroplast targeting sequences are known in the art and include thechloroplast small subunit of ribulose-1,5-bisphosphate carboxylase(Rubisco) (de Castro Silva Filho et al. (1996) Plant Mol. Biol. 30:769-780; Schnell et al. (1991) J. Biol. Chem. 266(5): 3335-3342);5-(enolpyruvyl)shikimate-3-phosphate synthase (EPSPS) (Archer et al.(1990) J. Bioenerg Biomemb. 22(6): 789-810); tryptophan synthase (Zhaoet al. (1995) J. Biol. Chem. 270(11): 6081-6087); plastocyanin (Lawrenceet al. (1997) J. Biol. Chem. 272(33): 20357-20363); chorismate synthase(Schmidt et al. (1993) J. Biol. Chem. 268(36): 27447-27457); and thelight harvesting chlorophyll a/b binding protein (LHBP) (Lamppa et al.(1988) J. Biol. Chem. 263: 14996-14999). See also Von Heijne et al.(1991) Plant Mol. Biol. Rep. 9: 104-126; Clark et al. (1989) J. Biol.Chem. 264: 17544-17550; Della-Cioppa et al. (1987) Plant Physiol. 84:965-968; Romer et al. (1993) Biochem. Biophys. Res. Comm. 196:1414-1421; and Shah et al. (1986) Science 233: 478-481.

Methods for transformation of chloroplasts are known in the art. See,e.g., Svab et al. (1990) Proc. Natl. Acad. Sci. USA 87: 8526-8530; Svaband Maliga (1993) Proc. Natl. Acad. Sci. USA 90: 913-917; Svab andMaliga (1993) EMBO J. 12: 601-606. The method relies on particle gundelivery of DNA containing a selectable marker and targeting of the DNAto the plastid genome through homologous recombination. Additionally,plastid transformation can be accomplished by transactivation of asilent plastid-borne transgene by tissue-preferred expression of anuclear-encoded and plastid-directed RNA polymerase. Such a system hasbeen reported in McBride et al. (1994) Proc. Natl. Acad. Sci. USA 91:7301-7305.

The polynucleotides of interest to be targeted to the chloroplast may beoptimized for expression in the chloroplast to account for differencesin codon usage between the plant nucleus and this organelle. In thismanner, the polynucleotide of interest may be synthesized usingchloroplast-preferred codons. See, e.g., U.S. Pat. No. 5,380,831, hereinincorporated by reference.

Introducing Nucleic Acids into Plants:

Methods for the production of transgenic plants comprising the clonednucleic acids, e.g., isolated ORFs and cDNAs encoding tolerance genes,are provided. Techniques for transforming plant cells with nucleic acidsare widely available and can be readily adapted. In addition to theBerger, Ausubel, and Sambrook references, useful general references forplant cell cloning, culture and regeneration include Jones (ed) (1995)Plant Gene Transfer and Expression Protocols—Methods in MolecularBiology, Volume 49 Humana Press Towata N.J.; Payne et al. (1992) PlantCell and Tissue Culture in Liquid Systems John Wiley & Sons, Inc. NewYork, N.Y. (Payne); and Gamborg and Phillips (eds) (1995) Plant Cell,Tissue and Organ Culture; Fundamental Methods Springer Lab Manual,Springer-Verlag (Berlin Heidelberg N.Y.) (Gamborg). A variety of cellculture media are described in Atlas and Parks (eds) The Handbook ofMicrobiological Media (1993) CRC Press, Boca Raton, Fla. (Atlas).Additional information for plant cell culture is found in availablecommercial literature such as the Life Science Research Cell CultureCatalogue (1998) from Sigma-Aldrich, Inc (St Louis, Mo.) (Sigma-LSRCCC)and, e.g., the Plant Culture Catalogue and supplement (1997) also fromSigma-Aldrich, Inc (St Louis, Mo.) (Sigma-PCCS). Additional detailsregarding plant cell culture are found in Croy, (ed.) (1993) PlantMolecular Biology, Bios Scientific Publishers, Oxford, U.K.

The nucleic acid constructs, e.g., DNA molecules plasmids, cosmids,artificial chromosomes, DNA, and RNA polynucleotides, are introducedinto plant cells, either in culture or in the organs of a plant by avariety of conventional techniques. Where the sequence is expressed, thesequence is optionally combined with transcriptional and translationalinitiation regulatory sequences which direct the transcription ortranslation of the sequence from the exogenous DNA in the intendedtissues of the transformed plant.

Isolated nucleic acid acids can be introduced into plants according toany of a variety of techniques known in the art. Techniques fortransforming a wide variety of higher plant species are also well knownand described in widely available technical, scientific, and patentliterature. See, e.g., Weising et al. (1988) Ann. Rev. Genet.22:421-477.

Such methods for introducing polynucleotide or polypeptides into plantsinclude stable transformation methods, transient transformation methods,virus-mediated methods, and breeding. “Stable transformation” isintended to mean that the nucleotide construct introduced into a plantintegrates into the genome of the plant and is capable of beinginherited by the progeny thereof. “Transient transformation” is intendedto mean that a polynucleotide is introduced into the plant and does notintegrate into the genome of the plant or a polypeptide is introducedinto a plant.

The DNA constructs, for example DNA fragments, plasmids, phagemids,cosmids, phage, naked or variously conjugated-DNA polynucleotides,(e.g., polylysine-conjugated DNA, peptide-conjugated DNA,liposome-conjugated DNA, etc.), or artificial chromosomes, can beintroduced directly into the genomic DNA of the plant cell usingtechniques such as electroporation and microinjection of plant cellprotoplasts, or the DNA constructs can be introduced directly to plantcells using ballistic methods, such as DNA particle bombardment.

Transformation protocols as well as protocols for introducingpolypeptides or polynucleotide sequences into plants may vary dependingon the type of plant or plant cell (i.e., monocot or dicot) targeted fortransformation. Suitable methods of introducing polypeptides andpolynucleotides into plant cells include microinjection (Crossway et al.(1986) Biotechniques 4:320-334), electroporation (Riggs et al. (1986)Proc. Natl. Acad. Sci. USA 83: 5602-5606, Agrobacterium-mediatedtransformation (U.S. Pat. No. 5,563,055 and U.S. Pat. No. 5,981,840),direct gene transfer (Paszkowski et al. (1984) EMBO J. 3: 2717-2722),and ballistic particle acceleration (see, for example, U.S. Pat. No.4,945,050; U.S. Pat. No. 5,879,918; U.S. Pat. Nos. 5,886,244; and,5,932,782; Tomes et al. (1995) in Plant Cell, Tissue, and Organ Culture:Fundamental Methods, ed. Gamborg and Phillips (Springer-Verlag, Berlin);McCabe et al. (1988) Biotechnology 6: 923-926); and Lec1 transformation(WO 00/28058). Also see Weissinger et al. (1988) Ann. Rev. Genet. 22:421-477; Sanford et al. (1987) Particulate Science and Technology 5:27-37 (onion); Christou et al. (1988) Plant Physiol. 87: 671-674(soybean); McCabe et al. (1988) Bio/Technology 6: 923-926 (soybean);Finer and McMullen (1991) In Vitro Cell Dev. Biol. 27P: 175-182(soybean); Singh et al. (1998) Theor. Appl. Genet. 96:319-324 (soybean);Datta et al. (1990) Biotechnology 8: 736-740 (rice); Klein et al. (1988)Proc. Natl. Acad. Sci. USA 85:4305-4309 (maize); Klein et al. (1988)Biotechnology 6:559-563 (maize); U.S. Pat. Nos. 5,240,855; 5,322,783;and, 5,324,646; Klein et al. (1988) Plant Physiol. 91: 440-444 (maize);Fromm et al. (1990) Biotechnology 8: 833-839 (maize); protocolspublished electronically by “IP.com” under the permanent publicationidentifiers IPCOM000033402D, IPCOM000033402D, and IPCOM000033402D andavailable at the “IP.com” website (cotton); Hooykaas-Van Slogteren etal. (1984) Nature (London) 311: 763-764; U.S. Pat. No. 5,736,369(cereals); Bytebier et al. (1987) Proc. Natl. Acad. Sci. USA 84:5345-5349 (Liliaceae); De Wet et al. (1985) in The ExperimentalManipulation of Ovule Tissues, ed. Chapman et al. (Longman, N.Y.), pp.197-209 (pollen); Kaeppler et al. (1990) Plant Cell Reports 9: 415-418and Kaeppler et al. (1992) Theor. Appl. Genet. 84: 560-566(whisker-mediated transformation); D'Halluin et al. (1992) Plant Cell 4:1495-1505 (electroporation); Li et al. (1993) Plant Cell Reports 12:250-255 and Christou and Ford (1995) Annals of Botany 75: 407-413(rice); Osjoda et al. (1996) Nature Biotechnology 14: 745-750 (maize viaAgrobacterium tumefaciens); all of which are herein incorporated byreference.

Microinjection techniques for injecting plant, e.g., cells, embryos,callus, and protoplasts, are known in the art and well described in thescientific and patent literature. For example, a number of methods aredescribed in Jones (ed) (1995) Plant Gene Transfer and ExpressionProtocols—Methods in Molecular Biology, Volume 49 Humana Press, Towata,N.J., as well as in the other references noted herein and available inthe literature.

For example, the introduction of DNA constructs using polyethyleneglycol precipitation is described in Paszkowski et al., EMBO J. 3:2717(1984). Electroporation techniques are described in Fromm et al., Proc.Natl. Acad. Sci. USA 82:5824 (1985). Ballistic transformation techniquesare described in Klein et al., Nature 327:70-73 (1987). Additionaldetails are found in Jones (1995) and Gamborg and Phillips (1995),supra, and in U.S. Pat. No. 5,990,387.

Alternatively, Agrobacterium-mediated transformation is employed togenerate transgenic plants. Agrobacterium-mediated transformationtechniques, including disarming and use of binary vectors, are also welldescribed in the scientific literature. See, e.g., Horsch, et al. (1984)Science 233:496; and Fraley et al. (1984) Proc. Natl. Acad. Sci. USA80:4803 and recently reviewed in Hansen and Chilton (1998) CurrentTopics in Microbiology 240:22 and Das (1998) Subcellular Biochemistry29: Plant Microbe Interactions, pp 343-363.

DNA constructs are optionally combined with suitable T-DNA flankingregions and introduced into a conventional Agrobacterium tumefacienshost vector. The virulence functions of the Agrobacterium tumefacienshost will direct the insertion of the construct and adjacent marker intothe plant cell DNA when the cell is infected by the bacteria. See, U.S.Pat. No. 5,591,616. Although Agrobacterium is useful primarily indicots, certain monocots can be transformed by Agrobacterium. Forinstance, Agrobacterium transformation of maize is described in U.S.Pat. No. 5,550,318.

Other methods of transfection or transformation include (1)Agrobacterium rhizogenes-mediated transformation (see, e.g.,Lichtenstein and Fuller (1987) In: Genetic Engineering, vol. 6, P W JRigby, Ed., London, Academic Press; and Lichtenstein; C. P., and Draper(1985) In: DNA Cloning, Vol. II, D. M. Glover, Ed., Oxford, IRI Press;WO 88/02405, published Apr. 7, 1988, describes the use of A. rhizogenesstrain A4 and its Ri plasmid along with A. tumefaciens vectors pARC8 orpARC16 (2) liposome-mediated DNA uptake (see, e.g., Freeman et al.(1984) Plant Cell Physiol. 25:1353), (3) the vortexing method (see,e.g., Kindle (1990) Proc. Natl. Acad. Sci., (USA) 87:1228.

DNA can also be introduced into plants by direct DNA transfer intopollen as described by Zhou et al. (1983) Methods in Enzymology,101:433; D. Hess (1987) Intern Rev. Cytol. 107:367; Luo et al. (1988)Plant Mol. Biol. Reporter 6:165. Expression of polypeptide coding genescan be obtained by injection of the DNA into reproductive organs of aplant as described by Pena et al. (1987) Nature 325:274. DNA can also beinjected directly into the cells of immature embryos and the desiccatedembryos rehydrated as described by Neuhaus et al. (1987) Theor. Appl.Genet. 75:30; and Benbrook et al. (1986) in Proceedings Bio ExpoButterworth, Stoneham, Mass., pp. 27-54. A variety of plant viruses thatcan be employed as vectors are known in the art and include cauliflowermosaic virus (CaMV), geminivirus, brome mosaic virus, and tobacco mosaicvirus.

Methods are known in the art for the targeted insertion of apolynucleotide at a specific location in the plant genome. In oneembodiment, the insertion of the polynucleotide at a desired genomiclocation is achieved using a site-specific recombination system. See,e.g., WO99/25821, WO99/25854, WO99/25840, WO99/25855, and WO99/25853,all of which are herein incorporated by reference. Briefly, apolynucleotide can be contained in transfer cassette flanked by twonon-recombinogenic recombination sites. The transfer cassette isintroduced into a plant having stably incorporated into its genome atarget site which is flanked by two non-recombinogenic recombinationsites that correspond to the sites of the transfer cassette. Anappropriate recombinase is provided and the transfer cassette isintegrated at the target site. The polynucleotide of interest is therebyintegrated at a specific chromosomal position in the plant genome.

Generation/Regeneration of Transgenic Plants:

Transformed plant cells which are derived by any of the abovetransformation techniques can be cultured to regenerate a whole plantthat possesses the transformed genotype and thus the desired phenotype.Such regeneration techniques rely on manipulation of certainphytohormones in a tissue culture growth medium, typically relying on abiocide and/or herbicide marker which has been introduced together withthe desired nucleotide sequences. Plant regeneration from culturedprotoplasts is described in Payne et al. (1992) Plant Cell and TissueCulture in Liquid Systems John Wiley & Sons, Inc. New York, N.Y.;Gamborg and Phillips (eds) (1995) Plant Cell, Tissue and Organ Culture;Fundamental Methods Springer Lab Manual, Springer-Verlag (BerlinHeidelberg N.Y.); Evans et al. (1983) Protoplasts Isolation and Culture,Handbook of Plant Cell Culture pp. 124-176, Macmillian PublishingCompany, New York; and Binding (1985) Regeneration of Plants, PlantProtoplasts pp. 21-73, CRC Press, Boca Raton. Regeneration can also beobtained from plant callus, explants, somatic embryos (Dandekar et al.(1989) J. Tissue Cult. Meth. 12:145; McGranahan, et al. (1990) PlantCell Rep. 8:512) organs, or parts thereof. Such regeneration techniquesare described generally in Klee et al. (1987), Ann. Rev. of Plant Phys.38:467-486. Additional details are found in Payne (1992) and Jones(1995), both supra, and Weissbach and Weissbach, eds. (1988) Methods forPlant Molecular Biology Academic Press, Inc., San Diego, Calif. Thisregeneration and growth process includes the steps of selection oftransformant cells and shoots, rooting the transformant shoots andgrowth of the plantlets in soil. These methods are adapted to producetransgenic plants bearing QTLs and other genes isolated according to themethods.

In addition, the regeneration of plants containing the polynucleotidesand introduced by Agrobacterium into cells of leaf explants can beachieved as described by Horsch et al. (1985) Science 227:1229-1231. Inthis procedure, transformants are grown in the presence of a selectionagent and in a medium that induces the regeneration of shoots in theplant species being transformed as described by Fraley et al. (1983)Proc. Natl. Acad. Sci. (U.S.A.) 80:4803. This procedure typicallyproduces shoots within two to four weeks and these transformant shootsare then transferred to an appropriate root-inducing medium containingthe selective agent and an antibiotic to prevent bacterial growth.Transgenic plants may be fertile or sterile.

It is not intended that plant transformation and expression ofpolypeptides that provide herbicide tolerance be limited to soybeanspecies. Indeed, it is contemplated that the polypeptides that providetolerance in soybean can also provide a similar phenotype whentransformed and expressed in other plants. Examples of plant genuses andspecies of interest include, but are not limited to, monocots and dicotssuch as corn (Zea mays), Brassica sp. (e.g., B. napus, B. rapa, B.juncea), particularly those Brassica species useful as sources of seedoil, alfalfa (Medicago sativa), rice (Oryza sativa), rye (Secalecereale), sorghum (Sorghum bicolor, Sorghum vulgare), millet (e.g.,pearl millet (Pennisetum glaucum), proso millet (Panicum miliaceum),foxtail millet (Setaria italica), finger millet (Eleusine coracana)),sunflower (Helianthus annuus), safflower (Carthamus tinctorius), wheat(Triticum aestivum), soybean (Glycine max), tobacco (Nicotiana tabacum),potato (Solanum tuberosum), peanuts (Arachis hypogaea), cotton(Gossypium barbadense, Gossypium hirsutum), sweet potato (Ipomoeabatatus), cassava (Manihot esculenta), coffee (Coffea spp.), coconut(Cocos nucifera), pineapple (Ananas comosus), citrus trees (Citrusspp.), cocoa (Theobroma cacao), tea (Camellia sinensis), banana (Musaspp.), avocado (Persea americana), fig (Ficus casica), guava (Psidiumguajava), mango (Mangifera indica), olive (Olea europaea), papaya(Carica papaya), cashew (Anacardium occidentale), macadamia (Macadamiaintegrifolia), almond (Prunus amygdalus), sugar beets (Beta vulgaris),sugarcane (Saccharum spp.), oats (Avena), barley (Hordeum), palm,legumes including beans and peas such as guar, locust bean, fenugreek,garden beans, cowpea, mungbean, lima bean, fava bean, lentils, chickpea,and castor, Arabidopsis, vegetables, ornamentals, grasses, conifers,crop and grain plants that provide seeds of interest, oil-seed plants,and other leguminous plants. Vegetables include tomatoes (Lycopersiconesculentum), lettuce (e.g., Lactuca sativa), green beans (Phaseolusvulgaris), lima beans (Phaseolus limensis), peas (Lathyrus spp.), andmembers of the genus Cucumis such as cucumber (C. sativus), cantaloupe(C. cantalupensis), and musk melon (C. melo). Ornamentals include azalea(Rhododendron spp.), hydrangea (Macrophylla hydrangea), hibiscus(Hibiscus rosasanensis), roses (Rosa spp.), tulips (Tulipa spp.),daffodils (Narcissus spp.), petunias (Petunia hybrida), carnation(Dianthus caryophyllus), poinsettia (Euphorbia pulcherrima), andchrysanthemum. Conifers include, for example, pines such as loblollypine (Pinus taeda), slash pine (Pinus elliotii), ponderosa pine (Pinusponderosa), lodgepole pine (Pinus contorta), and Monterey pine (Pinusradiata); Douglas-fir (Pseudotsuga menziesii); Western hemlock (Tsugacanadensis); Sitka spruce (Picea glauca); redwood (Sequoiasempervirens); true firs such as silver fir (Abies amabilis) and balsamfir (Abies balsamea); and cedars such as Western red cedar (Thujaplicata) and Alaska yellow-cedar (Chamaecyparis nootkatensis).

Promoters of bacterial origin that operate in plants include theoctopine synthase promoter, the nopaline synthase promoter and otherpromoters derived from native Ti plasmids. See, Herrara-Estrella et al.(1983), Nature, 303:209. Viral promoters include the 35S and 19S RNApromoters of cauliflower mosaic virus. See, Odell et al. (1985) Nature,313:810. Other plant promoters include Kunitz trypsin inhibitor promoter(KTI), SCP1, SUP, UCD3, the ribulose-1,3-bisphosphate carboxylase smallsubunit promoter and the phaseolin promoter. The promoter sequence fromthe E8 gene and other genes may also be used. The isolation and sequenceof the E8 promoter is described in detail in Deikman and Fischer (1988)EMBO J. 7:3315. Many other promoters are in current use and can becoupled to an exogenous DNA sequence to direct expression of the nucleicacid.

If expression of a polypeptide from a cDNA is desired, a polyadenylationregion at the 3′-end of the coding region is typically included. Thepolyadenylation region can be derived from the natural gene, from avariety of other plant genes, or from, e.g., T-DNA.

The vector comprising the sequences (e.g., promoters or coding regions)from genes encoding expression products and transgenes will typicallyinclude a nucleic acid subsequence, a marker gene which confers aselectable, or alternatively, a screenable, phenotype on plant cells.For example, the marker can encode biocide tolerance, particularlyantibiotic tolerance, such as tolerance to kanamycin, G418, bleomycin,hygromycin, or herbicide tolerance, such as tolerance to chlorsulforon,or phosphinothricin (the active ingredient in the herbicides bialaphosor Basta). See, e.g., Padgette et al. (1996) In: Herbicide-ResistantCrops (Duke, ed.), pp 53-84, CRC Lewis Publishers, Boca Raton(“Padgette, 1996”). For example, crop selectivity to specific herbicidescan be conferred by engineering genes into crops that encode appropriateherbicide metabolizing enzymes from other organisms, such as microbes.See Vasil (1996) In: Herbicide-Resistant Crops (Duke, ed.), pp 85-91,CRC Lewis Publishers, Boca Raton) (“Vasil”, 1996).

One of skill will recognize that after the recombinant expressioncassette is stably incorporated in transgenic plants and confirmed to beoperable, it can be introduced into other plants by sexual crossing. Anyof a number of standard breeding techniques can be used, depending uponthe species to be crossed. In vegetatively propagated crops, maturetransgenic plants can be propagated by the taking of cuttings or bytissue culture techniques to produce multiple identical plants.Selection of desirable transgenics is made and new varieties areobtained and propagated vegetatively for commercial use. In seedpropagated crops, mature transgenic plants can be self crossed toproduce a homozygous inbred plant. The inbred plant produces seedcontaining the newly introduced heterologous nucleic acid. These seedscan be grown to produce plants that would produce the selectedphenotype. Parts obtained from the regenerated plant, such as flowers,seeds, leaves, branches, fruit, and the like are included, provided thatthese parts comprise cells comprising the isolated nucleic acid. Progenyand variants, and mutants of the regenerated plants are also included,provided that these parts comprise the introduced nucleic acidsequences.

Transgenic or introgressed plants expressing a polynucleotide can bescreened for transmission of the nucleic acid by, for example, standardnucleic acid detection methods or by immunoblot protocols. Expression atthe RNA level can be determined to identify and quantitateexpression-positive plants. Standard techniques for RNA analysis can beemployed and include RT-PCR amplification assays using oligonucleotideprimers designed to amplify only heterologous or introgressed RNAtemplates and solution hybridization assays using marker or linked QTLspecific probes. Plants can also be analyzed for protein expression,e.g., by Western immunoblot analysis using antibodies that recognize theencoded polypeptides. In addition, in situ hybridization andimmunocytochemistry according to standard protocols can be done usingheterologous nucleic acid specific polynucleotide probes and antibodies,respectively, to localize sites of expression within transgenic tissue.Generally, a number of transgenic lines are usually screened for theincorporated nucleic acid to identify and select plants with the mostappropriate expression profiles.

In one example a transgenic plant that is homozygous for the addedheterologous nucleic acid; e.g., a transgenic plant that contains twoadded nucleic acid sequence copies, such as a gene at the same locus oneach chromosome of a homologous chromosome pair, is provided. Ahomozygous transgenic plant can be obtained by sexually mating(self-fertilizing) a heterozygous transgenic plant that contains asingle added heterologous nucleic acid, germinating some of the seedproduced and analyzing the resulting plants produced for alteredexpression of a polynucleotide relative to a control plant (e.g., anative, non-transgenic plant). Back-crossing to a parental plant andout-crossing with a non-transgenic plant can be used to introgress theheterologous nucleic acid into a selected background (e.g., an elite orexotic soybean line).

Plants may be produced by any suitable method, including breeding. Plantbreeding can be used to introduce desired characteristics (e.g., astably incorporated transgene or a genetic variant or genetic alterationof interest) into a particular plant line of interest, and can beperformed in any of several different ways. Pedigree breeding startswith the crossing of two genotypes, such as an elite line of interestand one other elite inbred line having one or more desirablecharacteristics (i.e., having stably incorporated a polynucleotide ofinterest, having a modulated activity and/or level of the polypeptide ofinterest, etc.) which complements the elite plant line of interest. Ifthe two original parents do not provide all the desired characteristics,other sources can be included in the breeding population. In thepedigree method, superior plants are selfed and selected in successivefilial generations. After a sufficient amount of inbreeding, successivefilial generations will serve to increase seed of the developed inbred.In specific embodiments, the inbred line comprises homozygous alleles atabout 95% or more of its loci. Various techniques known in the art canbe used to facilitate and accelerate the breeding (e.g., backcrossing)process, including, for example, the use of a greenhouse or growthchamber with accelerated day/night cycles, the analysis of molecularmarkers to identify desirable progeny, and the like.

In addition to being used to create a backcross conversion, backcrossingcan also be used in combination with pedigree breeding to modify anelite line of interest and a hybrid that is made using the modifiedelite line. As discussed previously, backcrossing can be used totransfer one or more specifically desirable traits from one line, thedonor parent, to an inbred called the recurrent parent, which hasoverall good agronomic characteristics yet lacks that desirable trait ortraits. However, the same procedure can be used to move the progenytoward the genotype of the recurrent parent but at the same time retainmany components of the non-recurrent parent by stopping the backcrossingat an early stage and proceeding with selfing and selection. Forexample, an F1, such as a commercial hybrid, is created. This commercialhybrid may be backcrossed to one of its parent lines to create a BC1 orBC2. Progeny are selfed and selected so that the newly developed inbredhas many of the attributes of the recurrent parent and yet several ofthe desired attributes of the non-recurrent parent. This approachleverages the value and strengths of the recurrent parent for use in newhybrids and breeding.

Therefore, a method of making a backcross conversion of an inbred lineof interest comprising the steps of crossing a plant from the inbredline of interest with a donor plant comprising at least one mutant geneor transgene conferring a desired trait (e.g., herbicide tolerance),selecting an F1 progeny plant comprising the mutant gene or transgeneconferring the desired trait, and backcrossing the selected F1 progenyplant to a plant of the inbred line of interest is provided. This methodmay further comprise the step of obtaining a molecular marker profile ofthe inbred line of interest and using the molecular marker profile toselect for a progeny plant with the desired trait and the molecularmarker profile of the inbred line of interest. In the same manner, thismethod may be used to produce an F1 hybrid seed by adding a final stepof crossing the desired trait conversion of the inbred line of interestwith a different plant to make F1 hybrid seed comprising a mutant geneor transgene conferring the desired trait.

Recurrent selection is a method used in a plant breeding program toimprove a population of plants. The method entails individual plantscross pollinating with each other to form progeny. The progeny are grownand the superior progeny selected by any number of selection methods,which include individual plant, half-sib progeny, full-sib progeny,selfed progeny and toperossing. The selected progeny arecross-pollinated with each other to form progeny for another population.This population is planted and again superior plants are selected tocross pollinate with each other. Recurrent selection is a cyclicalprocess and therefore can be repeated as many times as desired. Theobjective of recurrent selection is to improve the traits of apopulation. The improved population can then be used as a source ofbreeding material to obtain inbred lines to be used in hybrids or usedas parents for a synthetic cultivar. A synthetic cultivar is theresultant progeny formed by the intercrossing of several selectedinbreds.

Mass selection is a useful technique when used in conjunction withmolecular marker enhanced selection. In mass selection seeds fromindividuals are selected based on phenotype and/or genotype. Theseselected seeds are then bulked and used to grow the next generation.Bulk selection requires growing a population of plants in a bulk plot,allowing the plants to self-pollinate, harvesting the seed in bulk andthen using a sample of the seed harvested in bulk to plant the nextgeneration. Instead of self pollination, directed pollination could beused as part of the breeding program.

Mutation breeding is one of many methods that could be used to introducenew traits into an elite line. Mutations that occur spontaneously or areartificially induced can be useful sources of variability for a plantbreeder. The goal of artificial mutagenesis is to increase the rate ofmutation for a desired characteristic. Mutation rates can be increasedby many different means including temperature, long-term seed storage,tissue culture conditions, radiation such as X-rays, gamma rays (e.g.,cobalt 60 or cesium 137), neutrons, (product of nuclear fission ofuranium 235 in an atomic reactor), Beta radiation (emitted fromradioisotopes such as phosphorus 32 or carbon 14), or ultravioletradiation (typically from 2500 to 2900 nm), or chemical mutagens (suchas base analogues (5-bromo-uracil), related compounds (8-ethoxycaffeine), antibiotics (streptonigrin), alkylating agents (sulfurmustards, nitrogen mustards, epoxides, ethylenamines, sulfates,sulfonates, sulfones, lactones), azide, hydroxylamine, nitrous acid, oracridines. Once a desired trait is observed through mutagenesis thetrait may then be incorporated into existing germplasm by traditionalbreeding techniques, such as backcrossing. Details of mutation breedingcan be found in “Principals of Cultivar Development” Fehr, 1993Macmillan Publishing Company the disclosure of which is incorporatedherein by reference. In addition, mutations created in other lines maybe used to produce a backcross conversion of elite lines that comprisessuch mutations.

Methods of Modulating Expression:

In some embodiments, the activity and/or level of the polypeptide ismodulated (i.e., increased or decreased). An increase in the leveland/or activity of the polypeptide can be achieved by providing thepolypeptide to the plant. As discussed elsewhere herein, many methodsare known the art for providing a polypeptide to a plant including, butnot limited to, direct introduction of the polypeptide into the plant,introducing into the plant (transiently or stably) a polynucleotideconstruct encoding a polypeptide having the desired activity.

Methods for Identifying Mesotrione or Isoxazole Tolerant or SusceptibleSoybean Plants

Experienced plant breeders can recognize tolerant soybean plants in thefield, and can select the tolerant individuals or populations forbreeding purposes or for propagation. In this context, the plant breederrecognizes tolerant, and non-tolerant soybean plants. In some examples,the tolerance is observed in the context of herbicide carryover from theprevious crop season.

The screening and selection may also be performed by exposing plantscontaining said progeny germplasm to mesotrione and/or isoxazole in anassay and selecting those plants showing tolerance or sensitivity tomesotrione and/or isoxazole herbicides as containing soybean germplasminto which germplasm having tolerance or sensitivity to mesotrioneand/or isoxazole herbicides derived from the QTL mapped to linkage groupL has been introgressed. The live assay may be any such assay known tothe art, e.g., Taylor-Lovell et al. (2001) Weed Tech 15:95-102.

However, plant tolerance is a phenotypic spectrum consisting of extremesof high tolerance to non-tolerance with a continuum of intermediatetolerance phenotypes. Evaluation of these intermediate phenotypes usingreproducible assays are of value to scientists who seek to identifygenetic loci that impart tolerance, conduct marker assisted selectionfor tolerant population, and for introgression techniques to breed atolerance trait into an elite soybean line, for example. Describing thecontinuum of tolerance can be done using any known scoring system orderivative thereof, including the scoring systems described in theExamples.

Automated Detection/Correlation Systems

In some examples, the methods include an automated system for detectingmarkers and or correlating the markers with a desired phenotype (e.g.,tolerance or susceptibility). Thus, a typical system can include a setof marker probes or primers configured to detect at least one favorableallele of one or more marker locus associated with tolerance or improvedtolerance or sensitivity to mesotrione and/or isoxazole herbicides.These probes or primers are configured to detect the marker allelesnoted in the tables and examples herein, e.g., using any availableallele detection format, e.g., solid or liquid phase array baseddetection, microfluidic-based sample detection, etc.

In some examples markers involving linkage group L are used. In someexamples a marker closely linked to the marker locus of SATT495,P10649C-3, SATT182, S03859-1, S00224-1, SATT388, SATT313, SATT613 (oranother marker above SATT613), S03859-1-A, S08103-1-Q1, S08104-1-Q1,S08106-1-Q1, S08110-1-Q1, S08111-1-Q1, S08115-2-Q1, S08117-1-Q1,S08119-1-Q1, S08118-1-Q1, S08116-1-Q1, S08114-1-Q1, S08113-1-Q1,S08112-1-Q1, S08108-1-Q1, S08101-2-Q1, S08101-3-Q1, S08101-4-Q1,S08105-1-Q1, S08102-1-Q1, S08107-1-Q1, S08109-1-Q1, and S08101-1-Q1 isused, and the probe set is configured to detect the closely linkedmarker(s). In some examples, the marker locus is SATT495, P10649C-3,SATT182, S03859-1, S00224-1, SATT388, SATT313, SATT613 (or anothermarker above SATT613), S03859-1-A, S08103-1-Q1, S08104-1-Q1,S08106-1-Q1, S08110-1-Q1, S08111-1-Q1, S08115-2-Q1, S08117-1-Q1,S08119-1-Q1, S08118-1-Q1, S08116-1-Q1, S08114-1-Q1, S08113-1-Q1,S08112-1-Q1, S08108-1-Q1, S08101-2-Q1, S08101-3-Q1, S08101-4-Q1,S08105-1-Q1, S08102-1-Q1, S08107-1-Q1, S08109-1-Q1, and S08101-1-Q1, andthe probe set is configured to detect the locus. Similarly, alleles ofSATT495, P10649C-3, SATT182, S03859-1, S00224-1, SATT388, SATT313,SATT613 (or another marker above SATT613), S03859-1-A, S08103-1-Q1,S08104-1-Q1, S08106-1-Q1, S08110-1-Q1, S08111-1-Q1, S08115-2-Q1,S08117-1-Q1, S08119-1-Q1, S08118-1-Q1, S08116-1-Q1, S08114-1-Q1,S08113-1-Q1, S08112-1-Q1, S08108-1-Q1, S08101-2-Q1, S08101-3-Q1,S08101-4-Q1, S08105-1-Q1, S08102-1-Q1, S08107-1-Q1, S08109-1-Q1, andS08101-1-Q1 can be detected.

The typical system includes a detector that is configured to detect oneor more signal outputs from the set of marker probes or primers, oramplicon thereof, thereby identifying the presence or absence of theallele. A wide variety of signal detection apparatus are available,including photo multiplier tubes, spectrophotometers, CCD arrays, arraysand array scanners, scanning detectors, phototubes and photodiodes,microscope stations, galvo-scans, microfluidic nucleic acidamplification detection appliances and the like. The preciseconfiguration of the detector will depend, in part, on the type of labelused to detect the marker allele, as well as the instrumentation that ismost conveniently obtained for the user. Detectors that detectfluorescence, phosphorescence, radioactivity, pH, charge, absorbance,luminescence, temperature, magnetism or the like can be used. Typicaldetector examples include light (e.g., fluorescence) detectors orradioactivity detectors. For example, detection of a light emission(e.g., a fluorescence emission) or other probe label is indicative ofthe presence or absence of a marker allele. Fluorescent detection isgenerally used for detection of amplified nucleic acids (however,upstream and/or downstream operations can also be performed onamplicons, which can involve other detection methods). In general, thedetector detects one or more label (e.g., light) emission from a probelabel, which is indicative of the presence or absence of a markerallele. The detector(s) optionally monitors one or a plurality ofsignals from an amplification reaction. For example, the detector canmonitor optical signals which correspond to “real time” amplificationassay results.

System instructions that correlate the presence or absence of thefavorable allele with the predicted tolerance are also provided. Forexample, the instructions can include at least one look-up table thatincludes a correlation between the presence or absence of the favorablealleles and the predicted tolerance or improved tolerance. The preciseform of the instructions can vary depending on the components of thesystem, e.g., they can be present as system software in one or moreintegrated unit of the system (e.g., a microprocessor, computer orcomputer readable medium), or can be present in one or more units (e.g.,computers or computer readable media) operably coupled to the detector.As noted, in one typical example, the system instructions include atleast one look-up table that includes a correlation between the presenceor absence of the favorable alleles and predicted tolerance or improvedtolerance. The instructions also typically include instructionsproviding a user interface with the system, e.g., to permit a user toview results of a sample analysis and to input parameters into thesystem.

The system typically includes components for storing or transmittingcomputer readable data representing or designating the alleles detected,e.g., in an automated system. The computer readable media can includecache, main, and storage memory and/or other electronic data storagecomponents (hard drives, floppy drives, storage drives, etc.) forstorage of computer code. Data representing alleles detected can also beelectronically, optically, magnetically o transmitted in a computer datasignal embodied in a transmission medium over a network such as anintranet or internet or combinations thereof. The system can also oralternatively transmit data via wireless, IR, or other availabletransmission alternatives.

During operation, the system typically comprises a sample that is to beanalyzed, such as a plant tissue, or material isolated from the tissuesuch as genomic DNA, amplified genomic DNA, cDNA, amplified cDNA, RNA,amplified RNA, or the like.

The phrase “allele detection/correlation system” refers to a system inwhich data entering a computer corresponds to physical objects orprocesses external to the computer, e.g., a marker allele, and a processthat, within a computer, causes a physical transformation of the inputsignals to different output signals. In other words, the input data,e.g., amplification of a particular marker allele is transformed tooutput data, e.g., the identification of the allelic form of achromosome segment. The process within the computer is a set ofinstructions, or “program,” by which positive amplification orhybridization signals are recognized by the integrated system andattributed to individual samples as a genotype. Additional programscorrelate the identity of individual samples with phenotypic values ormarker alleles, e.g., statistical methods. In addition there arenumerous e.g., C/C++ programs for computing, Delphi and/or Java programsfor GUI interfaces, and productivity tools (e.g., Microsoft Excel and/orSigmaPlot) for charting or creating look up tables of relevantallele-trait correlations. Other useful software tools in the context ofthe integrated systems of the invention include statistical packagessuch as SAS, Genstat, Matlab, Mathematica, and S-Plus and geneticmodeling packages such as QU-GENE. Furthermore, additional programminglanguages such as visual basic are also suitably employed in theintegrated systems.

For example, tolerance marker allele values assigned to a population ofprogeny descending from crosses between elite lines are recorded in acomputer readable medium, thereby establishing a database correspondingtolerance alleles with unique identifiers for members of the populationof progeny. Any file or folder, whether custom-made or commerciallyavailable (e.g., from Oracle or Sybase) suitable for recording data in acomputer readable medium is acceptable as a database. Data regardinggenotype for one or more molecular markers, e.g., ASH, SSR, RFLP, RAPD,AFLP, SNP, isozyme markers or other markers as described herein, aresimilarly recorded in a computer accessible database. Optionally, markerdata is obtained using an integrated system that automates one or moreaspects of the assay (or assays) used to determine marker(s) genotype.In such a system, input data corresponding to genotypes for molecularmarkers are relayed from a detector, e.g., an array, a scanner, a CCD,or other detection device directly to files in a computer readablemedium accessible to the central processing unit. A set of systeminstructions (typically embodied in one or more programs) encoding thecorrelations between tolerance and the alleles of the invention is thenexecuted by the computational device to identify correlations betweenmarker alleles and predicted trait phenotypes.

Typically, the system also includes a user input device, such as akeyboard, a mouse, a touchscreen, or the like, for, e.g., selectingfiles, retrieving data, reviewing tables of maker information, etc., andan output device (e.g., a monitor, a printer, etc.) for viewing orrecovering the product of the statistical analysis.

Integrated systems comprising a computer or computer readable mediumcomprising set of files and/or a database with at least one data setthat corresponds to the marker alleles herein are provided. The systemsoptionally also includes a user interface allowing a user to selectivelyview one or more of these databases. In addition, standard textmanipulation software such as word processing software (e.g., MicrosoftWord™ or Corel Wordperfect™) and database or spreadsheet software (e.g.,spreadsheet software such as Microsoft Excel™ Corel Quattro Pro™, ordatabase programs such as Microsoft Access™ or Paradox™) can be used inconjunction with a user interface (e.g., a GUI in a standard operatingsystem such as a Windows, Macintosh, Unix or Linux system) to manipulatestrings of characters corresponding to the alleles or other features ofthe database.

The systems optionally include components for sample manipulation, e.g.,incorporating robotic devices. For example, a robotic liquid controlarmature for transferring solutions (e.g., plant cell extracts) from asource to a destination, e.g., from a microtiter plate to an arraysubstrate, is optionally operably linked to the digital computer (or toan additional computer in the integrated system). An input device forentering data to the digital computer to control high throughput liquidtransfer by the robotic liquid control armature and, optionally, tocontrol transfer by the armature to the solid support is commonly afeature of the integrated system. Many such automated robotic fluidhandling systems are commercially available. For example, a variety ofautomated systems are available from Caliper Technologies (Hopkinton,Mass.), which utilize various Zymate systems, which typically include,e.g., robotics and fluid handling modules. Similarly, the common ORCA®robot, which is used in a variety of laboratory systems, e.g., formicrotiter tray manipulation, is also commercially available, e.g., fromBeckman Coulter, Inc. (Fullerton, Calif.). As an alternative toconventional robotics, microfluidic systems for performing fluidhandling and detection are now widely available, e.g., from CaliperTechnologies Corp. (Hopkinton, Mass.) and Agilent technologies (PaloAlto, Calif.).

Systems for molecular marker analysis can include a digital computerwith one or more of high-throughput liquid control software, imageanalysis software for analyzing data from marker labels, datainterpretation software, a robotic liquid control armature fortransferring solutions from a source to a destination operably linked tothe digital computer, an input device (e.g., a computer keyboard) forentering data to the digital computer to control high throughput liquidtransfer by the robotic liquid control armature and, optionally, animage scanner for digitizing label signals from labeled probeshybridized, e.g., to markers on a solid support operably linked to thedigital computer. The image scanner interfaces with the image analysissoftware to provide a measurement of, e.g., nucleic acid probe labelintensity upon hybridization to an arrayed sample nucleic acidpopulation (e.g., comprising one or more markers), where the probe labelintensity measurement is interpreted by the data interpretation softwareto show whether, and to what degree, the labeled probe hybridizes to amarker nucleic acid (e.g., an amplified marker allele). The data soderived is then correlated with sample identity, to determine theidentity of a plant with a particular genotype(s) for particular markersor alleles, e.g., to facilitate marker assisted selection of soybeanplants with favorable allelic forms of chromosome segments involved inagronomic performance (e.g., tolerance or improved tolerance).

Optical images, e.g., hybridization patterns viewed (and, optionally,recorded) by a camera or other recording device (e.g., a photodiode anddata storage device) are optionally further processed in any of theembodiments herein, e.g., by digitizing the image and/or storing andanalyzing the image on a computer. A variety of commercially availableperipheral equipment and software is available for digitizing, storingand analyzing a digitized video or digitized optical image.

Stacking of Traits and Additional Traits of Interest

In some embodiments, the polynucleotide conferring the tolerance in theplants are engineered into a molecular stack with at least oneadditional polynucleotide. The additional polynucleotide may confer anyadditional trait of interest, such as tolerance to an additionalherbicide, insects, disease, or any other desirable trait. A trait, asused herein, refers to the phenotype derived from a particular sequenceor groups of sequences. For example, herbicide-tolerance polynucleotidesmay be stacked with any other polynucleotides encoding polypeptideshaving pesticidal and/or insecticidal activity, such as Bacillusthuringiensis toxic proteins (described in U.S. Pat. Nos. 5,366,892;5,747,450; 5,737,514; 5,723,756; 5,593,881; Geiser et al. (1986) Gene48:109; Lee et al. (2003) Appl. Environ. Microbiol. 69:4648-4657(Vip3A); Galitzky et al. (2001) Acta Crystallogr. D. Biol. Crystallogr.57:1101-1109 (Cry3Bb1); and Herman et al. (2004) J. Agric. Food Chem.52:2726-2734 (Cry1F)), lectins (Van Damme et al. (1994) Plant Mol. Biol.24: 825, pentin (described in U.S. Pat. No. 5,981,722), and the like.The combinations generated can also include multiple copies of any oneof the polynucleotides of interest.

In some embodiments, an herbicide-tolerance polynucleotide describedherein may be stacked with other herbicide-tolerance traits to create atransgenic plant with further improved properties. Otherherbicide-tolerance polynucleotides that could be used in suchembodiments include those conferring tolerance to the same herbicide byother modes of action, or a different herbicide. Other traits that couldbe combined with herbicide-tolerance polynucleotides include thosederived from polynucleotides that confer on the plant the capacity toproduce a higher level of 5-enolpyruvylshikimate-3-phosphate synthase(EPSPS), for example, as more fully described in U.S. Pat. Nos.6,248,876 B1; 5,627,061; 5,804,425; 5,633,435; 5,145,783; 4,971,908;5,312,910; 5,188,642; 4,940,835; 5,866,775; 6,225,114 B1; 6,130,366;5,310,667; 4,535,060; 4,769,061; 5,633,448; 5,510,471; U.S. Pat. No. Re.36,449; U.S. Pat. Nos. RE 37,287 E; and 5,491,288; and WO 97/04103; WO00/66746; WO 01/66704; and WO 00/66747. Other traits that could becombined with herbicide-tolerance polynucleotides include thoseconferring tolerance to sulfonylurea and/or imidazolinone, for example,as described more fully in U.S. Pat. Nos. 5,605,011; 5,013,659;5,141,870; 5,767,361; 5,731,180; 5,304,732; 4,761,373; 5,331,107;5,928,937; and 5,378,824; and international publication WO 96/33270.

In some embodiments, herbicide-tolerance polynucleotides of the plantsmay be stacked with, for example, hydroxyphenylpyruvatedioxygenaseswhich are enzymes that catalyze the reaction in whichpara-hydroxyphenylpyruvate (HPP) is transformed into homogentisate.Molecules which inhibit this enzyme and which bind to the enzyme inorder to inhibit transformation of the HPP into homogentisate are usefulas herbicides. Traits conferring tolerance to such herbicides in plantsare described in U.S. Pat. Nos. 6,245,968 B1; 6,268,549; and 6,069,115;and WO 99/23886. Other examples of suitable herbicide-tolerance traitsthat could be stacked with herbicide-tolerance polynucleotides includearyloxyalkanoate dioxygenase polynucleotides (which reportedly confertolerance to 2,4-D and other phenoxy auxin herbicides as well as toaryloxyphenoxypropionate herbicides as described, for example, inWO2005/107437) and dicamba-tolerance polynucleotides as described, forexample, in Herman et al. (2005) J. Biol. Chem. 280: 24759-24767.

Other examples of herbicide-tolerance traits that could be combined withherbicide-tolerance polynucleotides include those conferred bypolynucleotides encoding an exogenous phosphinothricinacetyltransferase, as described in U.S. Pat. Nos. 5,969,213; 5,489,520;5,550,318; 5,874,265; 5,919,675; 5,561,236; 5,648,477; 5,646,024;6,177,616; and 5,879,903. Plants containing an exogenousphosphinothricin acetyltransferase can exhibit improved tolerance toglufosinate herbicides, which inhibit the enzyme glutamine synthase.Other examples of herbicide-tolerance traits that could be combined withthe herbicide-tolerance polynucleotides include those conferred bypolynucleotides conferring altered protoporphyrinogen oxidase (protox)activity, as described in U.S. Pat. Nos. 6,288,306 B1; 6,282,837 B1; and5,767,373; and WO 01/12825. Plants containing such polynucleotides canexhibit improved tolerance to any of a variety of herbicides whichtarget the protox enzyme (also referred to as protox inhibitors).

Other examples of herbicide-tolerance traits that could be combined withherbicide-tolerance polynucleotides include those conferring toleranceto at least one herbicide in a plant such as, for example, a maize plantor horseweed. Herbicide-tolerant weeds are known in the art, as areplants that vary in their tolerance to particular herbicides. See, e.g.,Green and Williams (2004) “Correlation of Corn (Zea mays) InbredResponse to Nicosulfuron and Mesotrione,” poster presented at the WSSAAnnual Meeting in Kansas City, Mo., Feb. 9-12, 2004; Green (1998) WeedTechnology 12:474-477; Green and Ulrich (1993) Weed Science 41:508-516.The trait(s) responsible for these tolerances can be combined bybreeding or via other methods with herbicide-tolerance polynucleotidesto provide a plant as well as methods of use thereof.

In this manner, plants that are more tolerant to multiple herbicides aredisclosed. Accordingly, methods for growing a crop (i.e., forselectively controlling weeds in an area of cultivation) that comprisetreating an area of interest (e.g., a field or area of cultivation) withat least one herbicide to which the plant is tolerant are likewisedisclosed. In some embodiments, methods further comprise treatment withadditional herbicides to which the plant is tolerant. In suchembodiments, generally the methods permit selective control of weedswithout significantly damaging the crop. As used herein, an “area ofcultivation” comprises any region in which one desires to grow a plant.Such areas of cultivations include, but are not limited to, a field inwhich a plant is cultivated (such as a crop field, a sod field, a treefield, a managed forest, a field for culturing fruits and vegetables,etc), a greenhouse, a growth chamber, etc.

Herbicide-tolerant traits can also be combined with at least one othertrait to produce plants that further comprise a variety of desired traitcombinations including, but not limited to, traits desirable for animalfeed such as high oil content (e.g., U.S. Pat. No. 6,232,529); increaseddigestibility (e.g., modified storage proteins (U.S. application Ser.No. 10/053,410, filed Nov. 7, 2001); and thioredoxins (U.S. applicationSer. No. 10/005,429, filed Dec. 3, 2001)); the disclosures of which areherein incorporated by reference. Desired trait combinations alsoinclude LLNC (low linolenic acid content; see, e.g., Dyer et al. (2002)Appl. Microbiol. Biotechnol. 59:224-230) and OLCH (high oleic acidcontent; see, e.g., Fernandez-Moya et al. (2005) J. Agric. Food Chem.53:5326-5330).

Herbicide-tolerant traits of interest can also be combined with otherdesirable traits such as, for example, fumonisim detoxification genes(U.S. Pat. No. 5,792,931), avirulence and disease resistance genes(Jones et al. (1994) Science 266:789; Martin et al. (1993) Science262:1432; Mindrinos et al. (1994) Cell 78:1089), and traits desirablefor processing or process products such as modified oils (e.g., fattyacid desaturase genes (U.S. Pat. No. 5,952,544; WO 94/11516)); modifiedstarches (e.g., ADPG pyrophosphorylases (AGPase), starch synthases (SS),starch branching enzymes (SBE), and starch debranching enzymes (SDBE));and polymers or bioplastics (e.g., U.S. Pat. No. 5,602,321;beta-ketothiolase, polyhydroxybutyrate synthase, and acetoacetyl-CoAreductase (Schubert et al. (1988) J. Bacteriol. 170:5837-5847)facilitate expression of polyhydroxyalkanoates (PHAs)); the disclosuresof which are herein incorporated by reference. One could also combineherbicide-tolerant polynucleotides with polynucleotides providingagronomic traits such as male sterility (e.g., see U.S. Pat. No.5,583,210), stalk strength, flowering time, or transformation technologytraits such as cell cycle regulation or gene targeting (e.g., WO99/61619, WO 00/17364, and WO 99/25821); the disclosures of which areherein incorporated by reference.

In another embodiment, the herbicide-tolerant traits of interest canalso be combined with the Rcg1 sequence or biologically active variantor fragment thereof. The Rcg1 sequence is an anthracnose stalk rotresistance gene in corn. See, e.g., U.S. patent application Ser. Nos.11/397,153, 11/397,275, and 11/397,247, each of which is hereinincorporated by reference.

These stacked combinations can be created by any method including, butnot limited to, breeding plants by any conventional or TopCrossmethodology, or genetic transformation. If the sequences are stacked bygenetically transforming the plants, the polynucleotide sequences ofinterest can be combined at any time and in any order. For example, atransgenic plant comprising one or more desired traits can be used asthe target to introduce further traits by subsequent transformation. Thetraits can be introduced simultaneously in a co-transformation protocolwith the polynucleotides of interest provided by any combination oftransformation cassettes. For example, if two sequences will beintroduced, the two sequences can be contained in separatetransformation cassettes (trans) or contained on the same transformationcassette (cis). Expression of the sequences can be driven by the samepromoter or by different promoters. In certain cases, it may bedesirable to introduce a transformation cassette that will suppress theexpression of the polynucleotide of interest. This may be combined withany combination of other suppression cassettes or overexpressioncassettes to generate the desired combination of traits in the plant. Itis further recognized that polynucleotide sequences can be stacked at adesired genomic location using a site-specific recombination system.See, e.g., WO99/25821, WO99/25854, WO99/25840, WO99/25855, andWO99/25853, all of which are herein incorporated by reference.

Insect resistance genes may encode resistance to pests that have greatyield drag such as rootworm, cutworm, European Corn Borer, and the like.Such genes include, for example, Bacillus thuringiensis toxic proteingenes (U.S. Pat. Nos. 5,366,892; 5,747,450; 5,736,514; 5,723,756;5,593,881; and Geiser et al. (1986) Gene 48: 109); and the like.

Genes encoding disease resistance traits include detoxification genes,such as against fumonosin (U.S. Pat. No. 5,792,931); avirulence (avr)and disease resistance (R) genes (Jones et al. (1994) Science 266: 789;Martin et al. (1993) Science 262: 1432; and Mindrinos et al. (1994) Cell78: 1089); and the like.

Sterility genes can also be encoded in an expression cassette andprovide an alternative to physical detasseling. Examples of genes usedin such ways include male tissue-preferred genes and genes with malesterility phenotypes such as QM, described in U.S. Pat. No. 5,583,210.Other genes include kinases and those encoding compounds toxic to eithermale or female gametophytic development.

Methods of Controlling Weeds

Methods are provided for controlling weeds in an area of cultivation,preventing the development or the appearance of herbicide resistantweeds in an area of cultivation, producing a crop, and increasing cropsafety. The term “controlling,” and derivations thereof, for example, asin “controlling weeds” refers to one or more of inhibiting the growth,germination, reproduction, and/or proliferation of; and/or killing,removing, destroying, or otherwise diminishing the occurrence and/oractivity of a weed.

The mesotrione and/or isoxazole tolerant plants display a modifiedtolerance to herbicides and therefore allow for the application of oneor more herbicides at rates that would significantly damage controlplants and further allow for the application of combinations ofherbicides at lower concentrations than normally applied which stillcontinue to selectively control weeds. The mesotrione and/or isoxazoletolerant plants may also display tolerance to HPPD-inhibitor herbicidecarryover from a previous crop growing season. In addition, themesotrione and/or isoxazole tolerant plants can be used in combinationwith herbicide blends technology and thereby make the application ofchemical pesticides more convenient, economical, and effective for theproducer.

The methods comprise planting the area of cultivation with mesotrioneand/or isoxazole tolerant crop seeds or plants, and applying to anycrop, crop part, weed or area of cultivation thereof an effective amountof a mesotrione and/or isoxazole herbicide of interest. It is recognizedthat the herbicide can be applied before or after the crop is planted inthe area of cultivation. Such herbicide applications can include anapplication of a mesotrione and/or an isoxazole chemistry, or anycombination thereof.

In certain examples, the combination of herbicides comprises aglyphosate, a glufosinate, a dicamba, a bialaphos, a phosphinothricin, aprotox inhibitor, a sulfonylurea, an imidazolinone, a chlorsulfuron, animazapyr, a chlorimuron-ethyl, a quizalofop, an HPPD, a PPO, and/or afomesafen, or combinations thereof, wherein said effective amount istolerated by the crop and controls weeds. Any effective amount of theseherbicides can be applied, wherein the effective amount is any amountthat differentiates between plant cells, plants, and/or seed comprisinga mesotrione and/or isoxazole tolerance allele, a mesotrione and/orisoxazole tolerance polynucleotide, and/or a polynucleotide encoding anABC transporter protein that confers tolerance to herbicide formulationscomprising a mesotrione and/or isoxazole. In some examples theherbicides are applied simultaneously, in some examples the herbicidesare applied sequentially, in some examples the herbicides are applied aspre-emergent treatments, in some examples the herbicides are applied aspost-emergent treatments, in some examples the herbicides are applied asa combination of pre- and post-emergent treatments.

In some examples, the method of controlling weeds comprises planting thearea with mesotrione and/or isoxazole tolerant crop seeds or plants andapplying to the crop, crop part, seed of said crop or the area undercultivation, an effective amount of a herbicide, wherein said effectiveamount comprises an amount that is not tolerated by a control crop whenapplied to the control crop, crop part, seed or the area of cultivation,wherein the control crop does not express a polynucleotide that encodesan herbicide-tolerance polypeptide. In specific embodiments,combinations of herbicides may be used, such as when an additionaltolerance trait is incorporated into the plant.

In another embodiment, the method of controlling weeds comprisesplanting the area with a mesotrione and/or isoxazole tolerant crop seedsor plant and applying to the crop, crop part, seed of said crop or thearea under cultivation, an effective amount of a herbicide, wherein saideffective amount comprises a level that is above the recommended labeluse rate for the crop, wherein said effective amount is tolerated whenapplied to the mesotrione and/or isoxazole tolerant crop, crop part,seed, or the area of cultivation thereof.

Any herbicide can be applied to the tolerant crop, crop part, or thearea of cultivation containing said crop plant. Classifications ofherbicides (i.e., the grouping of herbicides into classes andsubclasses) is well-known in the art and includes classifications byHRAC (Herbicide Resistance Action Committee) and WSSA (the Weed ScienceSociety of America) (see also, Retzinger and Mallory-Smith (1997) WeedTechnology 11: 384-393). An abbreviated version of the HRACclassification (with notes regarding the corresponding WSSA group) isset forth in Table 1.

TABLE 1 Abbreviated HRAC classification table. HRAC WSSA Group Mode ofAction Chemical Family Active Ingredient Group A Inhibition of acetylAryloxyphenoxy- clodinafop- 1 CoA carboxylase propionate “FOPs”propargyl (ACCase) cyhalofop-butyl diclofop-methyl fenoxaprop-P-ethylfluazifop-P-butyl haloxyfop-R- methyl propaquizafop quizalofop-P-ethylCyclohexanedione alloxydim “DIMs” butroxydim clethodim cycloxydimprofoxydim sethoxydim tepraloxydin tralkoxydim Phenylpyrazoline “DEN”pinoxaden B Inhibition of Sulfonylurea amidosulfuron 2 acetolactateazimsulfuron synthase ALS bensulfuron-methyl (acetohydroxyacidchlorimuron-ethyl synthase AHAS) chlorsulfuron cinosulfuroncyclosulfamuron ethametsulfuron- methyl ethoxysulfuron flazasulfuronflupyrsulfuron- methyl-Na foramsulfuron halosulfuron- methylimazosulfuron iodosulfuron mesosulfuron metsulfuron-methyl nicosulfuronoxasulfuron primisulfuron- methyl prosulfuron pyrazosulfuron- ethylrimsulfuron sulfometuron- methyl sulfosulfuron thifensulfuron- methyltriasulfuron tribenuron-methyl trifloxysulfuron triflusulfuron- methyltritosulfuron Imidazolinone imazapic imazamethabenz- methyl imazamoximazapyr imazaquin imazethapyr Triazolopyrimidine cloransulam-methyldiclosulam florasulam flumetsulam metosulam penoxsulamPyrimidinyl(thio)benzoate bispyribac-Na pyribenzoxim pyriftalidpyrithiobac-Na pyriminobac- methyl Sulfonylaminocarbonyl-flucarbazone-Na triazolinone propoxycarbazone- Na C1 Inhibition ofTriazine ametryne 5 photosynthesis at atrazine photosystem II cyanazinedesmetryne dimethametryne prometon prometryne propazine simazinesimetryne terbumeton terbuthylazine terbutryne trietazine Triazinonehexazinone metamitron metribuzin Triazolinone amicarbazone Uracilbromacil lenacil terbacil Pyridazinone pyrazon = chloridazonPhenyl-carbamate desmedipham phenmedipham C2 Inhibition of Ureachlorobromuron 7 photosynthesis at chlorotoluron photosystem IIchloroxuron dimefuron diuron ethidimuron fenuron fluometuron (see F3)isoproturon isouron linuron methabenzthiazuron metobromuron metoxuronmonolinuron neburon siduron tebuthiuron Amide propanil pentanochlor C3Inhibition of Nitrile bromofenoxim 6 photosynthesis at bromoxynilphotosystem II ioxynil Benzothiadiazinone bentazon Phenyl-pyridazinepyridate pyridafol D Photosystem-I- Bipyridylium diquat 22 electrondiversion paraquat E Inhibition of Diphenylether acifluorfen-Na 14protoporphyrinogen bifenox oxidase (PPO) chlomethoxyfen fluoroglycofen-ethyl fomesafen halosafen lactofen oxyfluorfen Phenylpyrazole fluazolatepyraflufen-ethyl N-phenylphthalimide cinidon-ethyl flumioxazinflumiclorac-pentyl Thiadiazole fluthiacet-methyl thidiazimin Oxadiazoleoxadiazon oxadiargyl Triazolinone azafenidin carfentrazone-ethylsulfentrazone Oxazolidinedione pentoxazone Pyrimidindione benzfendizonebutafenacil Other pyraclonil profluazol flufenpyr-ethyl F1 Bleaching:Pyridazinone norflurazon 12 Inhibition of carotenoid biosynthesis at thephytoene desaturase step (PDS) Pyridinecarboxamide diflufenicanpicolinafen Other beflubutamid fluridone flurochloridone flurtamone F2Bleaching: Triketone mesotrione 27 Inhibition of 4- sulcotrionehydroxyphenyl- pyruvate- dioxygenase (4- HPPD) Isoxazole isoxachlortoleisoxazole Pyrazole benzofenap pyrazolynate pyrazoxyfen Otherbenzobicyclon F3 Bleaching: Triazole amitrole 11 Inhibition of (in vivoinhibition carotenoid of lycopene cyclase biosynthesis (unknown target)Isoxazolidinone clomazone 13 Urea fluometuron (see C2) Diphenyletheraclonifen G Inhibition of EPSP Glycine glyphosate 9 synthase sulfosate HInhibition of Phosphinic acid glufosinate- 10 glutamine ammoniumsynthetase bialaphos = bilanaphos I Inhibition of DHP Carbamate asulam18 (dihydropteroate) synthase K1 Microtubule Dinitroaniline benefin = 3assembly inhibition benfluralin butralin dinitramine ethalfluralinoryzalin pendimethalin trifluralin Phosphoroamidate amiprophos-methylbutamiphos Pyridine dithiopyr thiazopyr Benzamide propyzamide =pronamide tebutam Benzoic acid DCPA = chlorthal- dimethyl K2 Inhibitionof mitosis/ Carbamate chlorpropham 23 microtubule propham organisationcarbetamide K3 Inhibition of Chloroacetamide acetochlor 15 VLCFAs(Inhibition alachlor of cell division) butachlor dimethachlordimethanamid metazachlor metolachlor pethoxamid pretilachlor propachlorpropisochlor thenylchlor Acetamide diphenamid napropamide naproanilideOxyacetamide flufenacet mefenacet Tetrazolinone fentrazamide Otheranilofos cafenstrole piperophos L Inhibition of cell Nitrile dichlobenil20 wall (cellulose) chlorthiamid synthesis Benzamide isoxaben 21Triazolocarboxamide flupoxam Quinoline carboxylic acid quinclorac (for26 monocots) (also group O) M Uncoupling Dinitrophenol DNOC 24 (Membranedinoseb disruption) dinoterb N Inhibition of lipid Thiocarbamatebutylate 8 synthesis—not cycloate ACCase inhibition dimepiperate EPTCesprocarb molinate orbencarb pebulate prosulfocarb thiobencarb =benthiocarb tiocarbazil triallate vernolate Phosphorodithioate bensulideBenzofuran benfuresate ethofumesate Chloro-Carbonic-acid TCA 26 dalaponflupropanate O Action like indole Phenoxy-carboxylic-acid clomeprop 4acetic acid 2,4-D (synthetic auxins) 2,4-DB dichlorprop = 2,4- DP MCPAMCPB mecoprop = MCPP = CMPP Benzoic acid chloramben dicamba TBA Pyridinecarboxylic acid clopyralid fluroxypyr picloram triclopyr Quinolinecarboxylic acid quinclorac (also group L) quinmerac Otherbenazolin-ethyl P Inhibition of auxin Phthalamate naptalam 19 transportSemicarbazone diflufenzopyr-Na Z Unknown (actual Arylaminopropionic acidFlamprop-M- 25 mode of action methyl/-isopropyl unknown, but likely thatthey differ in mode of action between themselves and from other groups)Pyrazolium difenzoquat 26 Organoarsenical DSMA 17 MSMA Other bromobutide27 (chloro)-flurenol cinmethylin cumyluron dazomet dymron = daimuronmethyl-dimuron = methyl-dymron etobenzanid fosamine indanofan metamoxaziclomefone oleic acid pelargonic acid pyributicarb

Herbicides can be classified by their mode of action and/or site ofaction and can also be classified by the time at which they are applied(e.g., pre-emergent or post-emergent), by the method of application(e.g., foliar application or soil application), or by how they are takenup by or affect the plant. Mode of action generally refers to themetabolic or physiological process within the plant that the herbicideinhibits or otherwise impairs, whereas site of action generally refersto the physical location or biochemical site within the plant where theherbicide acts or directly interacts. Herbicides can be classified invarious ways, including by mode of action and/or site of action. Often,an herbicide-tolerance gene that confers tolerance to a particularherbicide or other chemical on a plant expressing it will also confertolerance to other herbicides or chemicals in the same class orsubclass, for example, a class or subclass set forth in the table above.Thus, in some examples, a transgenic plant is tolerant to more than oneherbicide or chemical in the same class or subclass, such as, forexample, an inhibitor of PPO, a sulfonylurea, a glyphosate, or asynthetic auxin. In some examples the plant is transgenic for one ormore of the herbicide tolerance traits, non-transgenic for one of moreof the tolerance traits, or any combination thereof

Typically, the plants provided can tolerate treatment with differenttypes of herbicides (i.e., herbicides having different modes of actionand/or different sites of action) as well as with higher amounts ofherbicides than previously known plants, thereby permitting improvedweed management strategies that are recommended in order to reduce theincidence and prevalence of herbicide-tolerant weeds. Specific herbicidecombinations can be employed to effectively control weeds.

A transgenic crop plant which can be selected for use in crop productionbased on the prevalence of herbicide-tolerant weed species in the areawhere the transgenic crop is to be grown is provided. Methods are knownin the art for assessing the herbicide tolerance of various weedspecies. Weed management techniques are also known in the art, such asfor example, crop rotation using a crop that is tolerant to an herbicideto which the local weed species are not tolerant. A number of entitiesmonitor and publicly report the incidence and characteristics ofherbicide-tolerant weeds, including the Herbicide Resistance ActionCommittee (HRAC), the Weed Science Society of America, and various stateagencies (see, e.g., herbicide tolerance scores for various broadleafweeds from the 2004 Illinois Agricultural Pest Management Handbook), andone of skill in the art would be able to use this information todetermine which crop and herbicide combinations should be used in aparticular location.

These entities also publish advice and guidelines for preventing thedevelopment and/or appearance of and controlling the spread of herbicidetolerant weeds (see, e.g., Owen and Hartzler (2004), 2005 HerbicideManual for Agricultural Professionals, Pub. WC 92 Revised (Iowa StateUniversity Extension, Iowa State University of Science and Technology,Ames, Iowa); Weed Control for Corn, Soybeans, and Sorghum, Chapter 2 of“2004 Illinois Agricultural Pest Management Handbook” (University ofIllinois Extension, University of Illinois at Urbana-Champaign, Ill.);Weed Control Guide for Field Crops, MSU Extension Bulletin E434(Michigan State University, East Lansing, Mich.)).

Also included are plant cells, plants, and/or seeds produced by any ofthe foregoing methods.

The present invention is illustrated by the following examples. Theforegoing and following description of the present invention and thevarious embodiments are not intended to be limiting of the invention butrather are illustrative thereof. Hence, it will be understood that theinvention is not limited to the specific details of these examples.

EXAMPLES Example 1: Identification of Isoxafutole Tolerant and SensitiveSoybean Lines—Herbicide Screening Bioassay and Intergroup AssociationMarker Based Diagnostic

Two soybean mapping populations were used to confirm significant QTLsrelated to tolerance and susceptibility to mesotrione and/or isoxazoleherbicides, to identify any potential QTLs associated with the toleranceor susceptibility to these herbicides, and to identify any varietalvariation due to differences between the two herbicide chemistries usedin the study. The mesotrione herbicide used in this study was Callisto®(referred to as Herbicide B); the isoxazole herbicide used in this studywas Balance Pro® (referred to as Herbicide A).

Part 1:

Studies were conducted using herbicides A and B and were performed attwo locations, Princeton, Ill. and Johnston, Iowa Herbicide screeningprotocols developed in the summer of 2008 determined the optimumherbicide rate, application timing and the best time to evaluate soybeaninjury following application.

Herbicide A and B were applied as a pre-plant incorporated herbicide.The application rate for Herbicide A was based on soil organic matterand was applied at half the recommended labeled rate. Herbicide B wasapplied at half the pre-plant incorporated label rate. Both herbicideswere applied using an ATV sprayer outfitted with a 10-foot boom, GPS anda Raven control system. The herbicides were applied at a rate of 30gallons of water per acre and a spray pressure of 35-40 psi. Anagitation system was used to maintain herbicide suspension in the waterspray solution. Since both herbicides A and B were used in the samefield, the sprayer was cleaned out between applications and a 10-footbuffer strip was used to help separate the two herbicides in the fieldto ensure no spray overlap.

The herbicides were incorporated into the soil to a depth of 1-2 inchesusing a field cultivator with rolling baskets 2-5 days followingapplication (Table 2). Incorporation was performed in two directions toensure even distribution of the herbicide in the soil.

The soybeans were planted into the soil to a depth of 1-1.5 inches usingan Almaco 4-row index planter set on 30-inch row spacing. All plots wereplanted as single row plots with 25 seeds for 4.5 feet of planted rowwith a three-foot alleyway. The planted population was approximately90,000 seeds per acre. Both Princeton and Johnston locations wereplanted on June 4. The herbicide application, planting, and rating datesfor both Princeton and Johnston locations are presented in Table 2.

TABLE 2 Herbicide Application, tillage, planting and rating datesUntreated Untreated Herbicide Planting 1st Crop 2nd Crop LocationApplication Tilled In Date Rating Stage Rating Stage Princeton, IL May29, 2009 Jun. 4, 2009 Jun. 4, 2009 Jun. 29, 2009 V3 Jul. 8, 2009 V6Johnston, IA Jun. 2, 2009 Jun. 4, 2009 Jun. 4, 2009 Jun. 30, 2009 V3Jul. 7, 2009 V5

Soybean varietal herbicide reactions were evaluated using visual scoresfor plant growth reduction (STNT) and crop injury rating (HERSC) usingdescriptions defined below. Two ratings were conducted at bothlocations; the initial rating (V3) was based off of the clearestdistinction of symptoms across the experiments. A second rating (V5 orV6) was conducted to ensure accuracy and note any varietal variationover time. An untreated check was used as a guide for the expected plantgrowth and development over time.

Plant Growth Reduction Rating (STNT)

1-9 herbicide reaction scale for plant growth reduction:

-   -   9=no plant growth reduction from the herbicide    -   8=<5% plant growth reduction    -   7=>5% and <20% plant growth reduction    -   6=>20% and <35% plant growth reduction    -   5=>35% and <50% plant growth reduction    -   4=>50 and <65% plant growth reduction    -   3=>65 and <80% plant growth reduction    -   2=>80 and <95% plant growth reduction    -   1=>95% plant growth reduction

Crop Injury Rating (HERSC)

1-9 herbicide reaction scale for crop injury (both chlorotic andnecrotic tissue):

-   -   9=no crop injury    -   8=<5% crop injury    -   7=>5% and <20% crop injury    -   6=>20% and <35% crop injury    -   5=>35% and <50% crop injury    -   4=>50 and <65% crop injury    -   3=>65 and <80% crop injury    -   2=>80 and <95% crop injury    -   1=>95% crop injury

Two mapping populations were used that contained known susceptible andtolerant parents that were fixed and carried different alleles for twoQTLs identified on linkage group L. The mapping populations werescreened using herbicide A and the herbicide screening protocoldescribed above. Two populations (Pop A and Pop B) of 90 randomlyselected F3:F5 lines were used in the study. Four replications of thepopulations were placed in a row by column design to help adjust meansdue to field variation. The parents of each population were replicated 3times per replication for a total of 12 times per location. An analysisof variance (ANOVA) was conducted to identify significant differencesbetween the varieties within the populations.

A variety trial was conducted using 144 varieties with herbicides A andB and the herbicide screening protocol described above. Fourreplications of the varieties were placed in a row by column design tohelp adjust means due to field variation for both herbicides. The 144lines included 52 susceptible and 61 tolerant lines identifiedpreviously as well as lines identified as moderate but containing thesusceptible or tolerant allele for the QTLs.

An ANOVA was run on the STNT and HERSC data to determine any significantdifferences between soybean varieties. The herbicide response and thevarieties were classified into tolerant and susceptible groups to beanalyzed using available SSR and SNP markers for identification of otherpotential QTLs associated with the trait. The tolerant and susceptibleclasses were analyzed to observe marker trait associations by comparingthe allelic frequencies of tolerant and susceptible varieties. Thisanalysis used all available genome wide data produced for the markersand the varieties to run the analysis. Significant markers were thenidentified and potential QTL regions were recognized for candidatescausing tolerant reactions. This data was used to help identifyadditional polymorphic markers within the mapping populations. Table 3indicates the results of the various varieties tested.

TABLE 3 Mapping population analysis Grouping HERSC score Adjusted meanSUS 1 2.2915 SUS 1 2.3105 SUS 1 2.333 SUS 1 2.3955 SUS 1 2.4045 SUS 12.4155 SUS 2 2.4825 SEG 2 2.547 SUS 2 2.577 SUS 2 2.888 SUS 2 2.9185 SUS3 3.083 SEG 3 3.091 SUS 3 3.1775 SEG 3 3.207 SUS 3 3.252 SUS 3 3.3115SEG 4 3.427 SEG? 4 3.5305 SEG 4 3.544 SUS 4 3.5845 SEG 4 3.589 SUS 43.6135 SUS 4 3.6575 SEG 4 3.662 SEG 5 3.729 SEG 5 3.73 SUS 5 3.7435 SEG5 3.843 TOL 5 3.89 SEG 5 3.9255 SEG 5 3.9925 SEG 5 4.0415 SEG 5 4.0755SEG 5 4.1025 TOL 5 4.1315 TOL 5 4.171 SEG 6 4.273 SEG 6 4.276 SEG 64.325 SEG? 4 4.331 SEG 4 4.375 TOL 6 4.4225 SEG 6 4.436 SEG 6 4.456 SEG6 4.4955 TOL 6 4.5525 TOL 6 4.5905 TOL 6 4.6135 SEG 6 4.627 TOL 6 4.652SEG 6 4.652 SEG 6 4.7305 TOL 6 4.7785 TOL 6 4.7805 TOL 6 4.814 SEG? 64.815 TOL 6 4.827 TOL 6 4.883 SEG 6 4.955 SEG 7 5.005 SEG 7 5.018 TOL 75.0185 SEG 7 5.048 TOL 7 5.053 TOL 7 5.0635 TOL 7 5.0895 TOL 7 5.151 TOL6 5.239 SEG 7 5.2525 TOL 7 5.258 SEG 7 5.263 TOL 5 5.312 TOL 7 5.357 TOL7 5.358 SEG? 8 5.4165 TOL 8 5.4475 SEG? 8 5.512 TOL 8 5.5645 TOL 85.5975 TOL 8 5.6185 TOL 8 5.707 TOL 8 5.713 TOL 9 5.8935 TOL 9 5.904 TOL9 6.022 TOL 7 6.0235 SEG? 9 6.1865 TOL 9 6.591 TOL 9 6.842 SUS 1 2.049TOL 9 5.9145 SUS 2 2.733 SUS 2 2.748 SUS 2 2.801 SUS 2 2.883 SUS 2 2.938SUS 2 2.9515 SUS 2 2.9955 SEG? 2 3.0555 SUS 1 2.4295 SUS 1 2.5185 SUS 12.6205 SUS 1 2.6395 SUS 3 3.1315 SEG? 3 3.1925 SUS 3 3.193 SEG 3 3.216SEG 3 3.267 SUS 3 3.2875 SUS 3 3.2885 SUS 3 3.3375 SUS 4 3.3435 SUS 43.3555 SUS 4 3.361 SUS 4 3.428 SUS 4 3.449 SUS 4 3.539 SUS 4 3.5505 SUS4 3.6335 SUS 5 3.681 SUS 5 3.793 SUS 5 3.8215 SUS 4 3.8395 SUS 5 4.01SEG? 5 4.0635 SUS 5 4.072 SEG 5 4.1245 SUS 5 4.1535 TOL 5 4.239 SEG 64.3385 SEG 6 4.489 TOL 6 4.5315 SEG 6 4.5915 SEG 6 4.721 TOL 6 4.7345TOL 6 4.8215 TOL 6 4.8495 TOL 6 4.8625 TOL 6 4.867 TOL 6 4.944 TOL 44.973 TOL 7 5.0845 TOL 7 5.0885 TOL 5 5.0955 TOL 7 5.1245 TOL 7 5.1505TOL 7 5.1695 TOL 4 5.1885 TOL 7 5.221 TOL 7 5.228 SEG 7 5.2285 SEG 75.2805 TOL 7 5.3305 SEG 7 5.3345 TOL 8 5.381 TOL 8 5.3835 TOL 8 5.414TOL 8 5.5165 TOL 8 5.535 TOL 8 5.55 TOL 8 5.5925 TOL 8 5.6125 TOL 85.617 TOL 8 5.6275 TOL 8 5.6435 TOL 8 5.67 TOL 8 5.7255 TOL 8 5.7645 TOL8 5.8155 TOL 8 5.8245 TOL 8 5.8835 TOL 9 5.885 TOL 9 5.8885 TOL 9 5.9165TOL 9 5.964 TOL 9 6.0095 TOL 9 6.2345 TOL 9 6.2655 TOL 9 6.286 TOL 76.3875 TOL 9 6.599 SUS 3 3.069 TOL 7 5.359

The experimental means for Herbicide A across both locations for HERSC2was 4.695 with a standard deviation of 1.94. The coefficient ofvariation across the locations was 26.7.

Example 2: Determination of QTL and Marker Associations/IntergroupAnalysis

There was significant (P<0.001) difference across varieties forHerbicide A. The LSD was 1.316 across all varieties. Predicted means bylocation were calculated using a linear model for the locations. Thevarieties were looked at individually by the adjusted means by location,the LSD value, the average score by location, and the 2008 data for eachvariety. This gave an overall view of each variety and allowed for asimple classification across all varieties. Any variety that showed ahigh rate of variability across the data was automatically placed in thesegregating group.

The results of the ANOVA for both Herbicides A and B are reported inTable 4. The model used for the analysis was the incomplete block designand the affect of the model is described through the relative efficiencyand the Czekanowski Coefficient (Czek Coeff). The relative efficiency iscomparing the error terms of the more complex block (incomplete block,ICB) to the less complex model (randomized complete block, RCB). Therelative efficiency for the variety trial using herbicide A was 111% andherbicide B was 123%. The Czek Coeff which reports the top 10 and 20percent of the entries that were the same for both the RCB and ICBdesigns was 73 and 83% for the top 10% of entries and 86 and 90% for thetop 20% of the entries for the variety trials using herbicides A and B,respectfully.

TABLE 4 Analysis of variance for the variety trial Herbicide A HerbicideB HERSC HERSC Experiment Mean 4.695 4.585 CV (%) 26.7 26.6 Model IB IBRel Eff 111 123 Czek Coeff .10 0.73 0.87 Czek Coeff .20 0.86 0.9 #Environments 2 2 Total Blocks 8 8 p.val (Entry) 0 0 % V 85.7 82.9 % VL0.8 2.9 % E 13.5 14.1 SED between 2 entry means 0.658 0.637 2′SEDbetween 2 entry means (LSD) 1.316 1.274

Using this method of classification the varieties were grouped accordingto their reactions to herbicides A and B. For herbicide A there were 32tolerant, 67 moderate, 37 susceptible and 8 segregating lines. Forherbicide B there were 29 tolerant, 75 moderate, 32 susceptible and 8segregating lines.

An Intergroup Allele Frequency Distribution analysis was conducted usingGeneFlow™ version 7.0 software. An intergroup allele frequencydistribution analysis provides a method for finding non-randomdistributions of alleles between two phenotypic groups.

During processing, a contingency table of allele frequencies wasconstructed and from this a G-statistic and probability were calculated.The G-statistic was adjusted by using the William's correction factor.The probability value was adjusted to take into account the fact thatmultiple tests are being done (thus, there is some expected rate offalse positives). The adjusted probability is proportional to theprobability that the observed allele distribution differences betweenthe two classes would occur by chance alone. The lower that probabilityvalue, the greater the likelihood that the tolerance phenotype and themarker will co-segregate. A more complete discussion of the derivationof the probability values can be found in the GeneFlow™ version 7.0software documentation. See also Sokal and Rolf (1981), Biometry: ThePrinciples and Practices of Statistics in Biological Research, 2nd ed.,San Francisco, W. H. Freeman and Co.

The underlying logic is that markers with significantly different alleledistributions between the tolerant and non-tolerant groups (i.e.,non-random distributions) might be associated with the trait and can beused to separate them for purposes of marker assisted selection ofsoybean lines with previously uncharacterized tolerance or non-toleranceor sensitivity to mesotrione and/or isoxazole herbicides. The presentanalysis examined one marker locus at a time and determined if theallele distribution within the tolerant group is significantly differentfrom the allele distribution within the non-tolerant group. Astatistically different allele distribution is an indication that themarker is linked to a locus that is associated with tolerance ornon-tolerance or sensitivity to mesotrione and/or isoxazole herbicides.In this analysis, unadjusted probabilities less than one are consideredsignificant (the marker and the phenotype show linkage disequilibrium),and adjusted probabilities less than approximately 0.05 are consideredhighly significant. Allele classes represented by less than 5observations across both groups were not included in the statisticalanalysis. In this analysis, 1043 marker loci had enough observations foranalysis.

This analysis compares the plants' phenotypic score with the genotypesat the various loci. This type of intergroup analysis neither generatesnor requires any map data. Subsequently, map data (for example, acomposite soybean genetic map) is relevant in that multiple significantmarkers that are also genetically linked can be considered ascollaborating evidence that a given chromosomal region is associatedwith the trait of interest.

For the herbicide A variety trial, the analysis identified 275 markers(P<0.05), of these 275 markers identified, 243 of the markers had beenpreviously mapped to a particular genomic position. This allowed forfurther analysis to identify potential genomic regions for genes and toeliminate marker regions that are likely not associated with the nativetolerance to the herbicide. There were a total of 6 regions identifiedwhere multiple markers were pointing to a particular genomic region(Table 5). The regions identified included regions on B2, D2, E, G, Land 7 unmapped (UM) markers. Of the original 275 markers identified, 112markers were used to identify the 6 genomic regions.

TABLE 5 Potential genomic regions for Herbicide A Linkage group cM(position) Markers Comment B2  92.2-111.86 31 D2 88.11-92.58  6 E82.16-100.51 37 G 78.6-85.82 22 L 10.1-14.31 4 Highest significance L41.09-46.35  5 UM 7 Highly significant <.008

A similar analysis was conducted for the tolerant and susceptibleclasses to Herbicide B where 274 markers were identified (P<0.05). Ofthe 274 markers identified 239 markers had been previously mapped to aparticular genomic position. Similar regions to Herbicide A wereidentified that included B2, E, G, L, and 10 UM markers (Table 6). Apotential region on N was added and the region on D2 was taken off forHerbicide B tolerance. Of the original 274 markers identified 116markers were used to help identify the 6 regions.

TABLE 6 Potential genomic regions for Herbicide B Linkage group cM(position) Markers Comment B2  92.2-111.86 20 E 82.16-100.51 41 G77.87-85.82  17 L 10.1-14.31 4 Highest significance L 41.09-42.17  3 N37.11-53.27  21 UM 10 Highly significant <.008

Additional observations were made through looking at the tolerant,moderate, susceptible and segregating classes to each herbicide asassigned through the variety trial. Of the 144 varieties in theherbicide trial, 21 were tolerant to both herbicides, 54 displayedmoderate tolerance to both herbicides, and 28 displayed susceptiblereactions to both herbicides. There were a total of 31 varieties thatwere classified one class higher or lower to herbicide A or B. Forexample 11 varieties were tolerant to herbicide A and moderate toherbicide B, where they were lowered 1 class from herbicide Aclassification to herbicide B classification. There were zero lines thatwere tolerant to one herbicide and susceptible to the other. This issummarized in Table 7.

TABLE 7 Variety reactions to both herbicides Herbicide B (mesotrione)Class Tol Moderate Sus Seg Herbicide A Tol 21 11 0 0 (isoxazole)Moderate 8 54 3 2 Sus 0 9 28 0 Seg 0 1 1 6

The significant markers were observed for both variety classes to eachof the chemistries. Of the 275 and 274 markers that were significant forthe Herbicide A and Herbicide B reactions, 144 markers were significantfor both variety reactions. As observed in the variety trial analysis,the regions of potential QTLs were observed for both classes on B2, E,G, and L; with the most significant markers on L from 10.1-14.31 cM(Tables 5 and 6).

Table 8 shows the allele distribution for marker 503859, which isclosely linked to this region, among the 144 lines analyzed; 32 tolerantlines, 37 non-tolerant (susceptible) lines, 67 moderate, and 8segregating lines analyzed. Marker calls for the 503859 locus wereavailable for 111 of the 144 lines.

TABLE 8 Allele distribution S03859 allele (LG-L) Phenotype Adjusted mean1, 1 Susceptible 1.6085 1, 1 Susceptible 1.7085 1, 1 Susceptible 1.8675Susceptible 1.9175 1, 1 Susceptible 2.006 1, 1 Susceptible 2.212Susceptible 2.272 Susceptible 2.283 1, 1 Susceptible 2.2845 1, 1Susceptible 2.327 1, 1 Susceptible 2.4255 1, 1 Susceptible 2.643Susceptible 2.6815 1, 1 Susceptible 2.781 1, 1 Susceptible 2.8325 1, 1Susceptible 2.838 1, 1 Susceptible 2.881 1, 1 Susceptible 2.883 1, 1Susceptible 2.9005 1, 1 Susceptible 2.927 1, 1 Susceptible 2.992 1, 1Susceptible 2.994 Susceptible 3.056 1, 1 Susceptible 3.1475 3, 3Susceptible 3.215 1, 1 Susceptible 3.2835 1, 3 Susceptible 3.3085Susceptible 3.3385 1, 1 Susceptible 3.3875 1, 1 Susceptible 3.3885 1, 1Susceptible 3.4085 1, 1 Segregating 3.5095 1, 1 Susceptible 3.6345 1, 1Susceptible 3.711 1, 1 Susceptible 3.7595 1, 3 Moderate 3.851 Moderate3.919 Susceptible 3.9385 1, 1 Moderate 3.967 3, 3 Moderate 4.067Moderate 4.107 3, 3 Susceptible 4.1605 1, 1 Susceptible 4.1645 1, 3Moderate 4.17 3, 3 Moderate 4.179 3, 3 Moderate 4.3415 3, 3 Moderate4.35 1, 1 Moderate 4.357 3, 3 Moderate 4.4295 3, 3 Moderate 4.4495Moderate 4.4765 3, 3 Moderate 4.524 1, 1 Moderate 4.555 Moderate 4.63753, 3 Moderate 4.6615 3, 3 Moderate 4.676 3, 3 Moderate 4.678 Segregating4.723 Moderate 4.7575 3, 3 Segregating 4.7645 3, 3 Moderate 4.7675Moderate 4.771 Moderate 4.7875 3, 3 Moderate 4.797 1, 3 Moderate 4.846Tolerant 4.85 Moderate 4.891 1, 1 Moderate 4.9085 3, 3 Moderate 4.90953, 3 Moderate 4.9395 3, 3 Tolerant 4.943 1, 1 Moderate 4.961 1, 1Moderate 5.015 3, 3 Moderate 5.0195 3, 3 Moderate 5.051 3, 3 Moderate5.1305 Tolerant 5.1475 3, 3 Moderate 5.1495 Moderate 5.2105 3, 3Tolerant 5.2125 3, 3 Moderate 5.214 3, 3 Tolerant 5.215 3, 3 Moderate5.2565 3, 3 Moderate 5.2795 3, 3 Moderate 5.2945 3, 3 Moderate 5.3125 3,3 Moderate 5.3145 3, 3 Moderate 5.3345 3, 3 Moderate 5.335 3, 3 Tolerant5.3365 Tolerant 5.377 3, 3 Moderate 5.39 3, 3 Segregating 5.3905 3, 3Segregating 5.4675 3, 3 Moderate 5.4835 3, 3 Segregating 5.4925 3, 3Moderate 5.4975 3, 3 Tolerant 5.518 3, 3 Moderate 5.524 Segregating5.541 Tolerant 5.574 1, 1 Moderate 5.5895 3, 3 Moderate 5.6025 Moderate5.616 3, 3 Tolerant 5.6685 3, 3 Tolerant 5.6925 3, 3 Moderate 5.7005 3,3 Moderate 5.7095 Tolerant 5.7165 3, 3 Moderate 5.7315 Moderate 5.741Moderate 5.75 3, 3 Tolerant 5.7545 3, 3 Moderate 5.7625 3, 3 Moderate5.7705 3, 3 Moderate 5.7715 3, 3 Moderate 5.7835 3, 3 Segregating 5.78753, 3 Moderate 5.798 3, 3 Moderate 5.851 3, 3 Moderate 5.852 3, 3Tolerant 5.857 3, 3 Tolerant 5.87 3, 3 Moderate 5.8705 Tolerant 5.914Tolerant 5.948 3, 3 Tolerant 5.9525 3, 3 Tolerant 5.9675 Tolerant 6.02453, 3 Moderate 6.026 3, 3 Moderate 6.0275 3, 3 Tolerant 6.034 3, 3Tolerant 6.042 3, 3 Tolerant 6.054 Tolerant 6.092 Tolerant 6.1295 3, 3Moderate 6.2395 3, 3 Tolerant 6.2475 3, 3 Tolerant 6.2695 Tolerant 6.2753, 3 Tolerant 6.387 3, 3 Tolerant 6.431 3, 3 Tolerant 6.6535 Tolerant6.674

The non-random distribution of alleles between the tolerant andnon-tolerant plant groups at the marker loci in Table 8 is good evidencethat a QTL influencing tolerance or sensitivity to mesotrione and/orisoxazole herbicides is linked to these marker loci.

QTLs related to tolerance and susceptibility to mesotrione and/orisoxazole herbicides were found to essentially co-localize with QTLsrelated to tolerance to PPO inhibitor herbicides to linkage group L, asshown in the Examples below. Thus, PPO tolerance could be used to finemap the QTL and to identify putative candidate genes as shown below.

Example 3: Identification of Sulfentrazone Tolerant and SensitiveSoybean Lines—Herbicide Screening Bioassay and Intergroup AssociationMarker Based Diagnostic

Sulfentrazone is a PPO inhibitor and is the active ingredient inAuthority® herbicide. Authority® 75DF (FMC Corp., Philadelphia, Pa.,USA) is a 75% active ingredient formulation of sulfentrazone containingno other active ingredients.

Part 1: Herbicide Bioassay

One hundred sixteen (116) elite soybean lines were screened forsulfentrazone tolerance using the following protocol. Seed of soybeanvarieties with adequate seed quality, having greater than 85% warmgermination were used.

Design and Replication:

After planting, entries were set up in a randomized complete blockdesign, blocked by replication. Three replications per experiment wereused. One or more of well established check variety were included in theexperiment, such as available public sector check lines.

Non-tolerant check: Pioneer 9692, Asgrow A4715Tolerant check: Pioneer 9584, Syngenta 55960Growing conditions were as follows (greenhouse/growth chamber): 16 hrphotoperiod @ 85° F. (w/75° nighttime set back). Lighting is critical tothe success of the screening as stated below.

Method of Screening:

Four inch plastic pots were filled with a high quality universal pottingsoil. Entries were planted 1 inch deep at the rate of 5 seeds/pot. Abar-coded plastic stake was used to identify each entry. After plantingthe pots were allowed to sit in greenhouse overnight to acclimate tosoil and improve germination. The following day a sulfentrazoneherbicide solution was slowly poured over each pot and allowed to evenlysoak through entire soil profile. This ensured that each seed wasexposed to an equal amount of sulfentrazone. Pots were placed onaluminum trays and placed in a greenhouse or growth chamber under highintensity light conditions with photosynthetic photon flux density(PPFD) of at least 500 mol/m/s. Proper lighting conditions werenecessary for this screening due to the nature of the PPO inhibitorused. Pots were lightly watered so that herbicide was not leached fromthe soil profile. After soybean emergence the pots were watered bykeeping aluminum trays filled with ¾″ of water under each pot.

Herbicide Solution:

A) Mix a stock solution of 0.926 g Authority® 75DF (FMC Corp.),thoroughly dissolved in 1000 ml of water.B) Mix 10 ml of STOCK SOLUTION in 1000 ml of water to create finalsolution.C) Pour 100 ml of FINAL SOLUTION over each pot.

Recording Data:

-   -   10-14 days after treatment, plants were ready to be scored. All        scores were based on a comparison to the checks and evaluated as        follows:    -   9=Equivalent or better when compared to the tolerant check    -   7=Very little damage or response noted.    -   5=Intermediate response or damage    -   3=Major damage, including stunting and foliar necrosis    -   1=Severe damage, including severe stunting and necrosis;        equivalent or worse when compared to the non-tolerant check

Of the 116 soybean lines screened, 102 showed at least some tolerance tosulfentrazone based herbicides and 11 showed high sensitivity. Areference relevant to this protocol would be: Dayan et al. (1997)‘Soybean (Glycine max) cultivar differences in response tosulfentrazone’ Weed Science 45:634-641.

Part 2: Intergroup Analysis

An “Intergroup Allele Frequency Distribution” analysis was conductedusing GeneFlow™ version 7.0 software as described above. An intergroupallele frequency distribution analysis provides a method for findingnon-random distributions of alleles between two phenotypic groups.

During processing, a contingency table of allele frequencies wasconstructed and from this a G-statistic and probability were calculated.The G statistic was adjusted by using the William's correction factor.The probability value was adjusted to take into account the fact thatmultiple tests are being done (thus, there is some expected rate offalse positives). The adjusted probability is proportional to theprobability that the observed allele distribution differences betweenthe two classes would occur by chance alone. The lower that probabilityvalue, the greater the likelihood that the tolerance phenotype and themarker will co-segregate. A more complete discussion of the derivationof the probability values can be found in the GeneFlow™ version 7.0software documentation. See also Sokal and Rolf (1981), Biometry: ThePrinciples and Practices of Statistics in Biological Research, 2nd ed.,San Francisco, W. H. Freeman and Co.

The underlying logic is that markers with significantly different alleledistributions between the tolerant and non-tolerant groups (i.e.,non-random distributions) might be associated with the trait and can beused to separate them for purposes of marker assisted selection ofsoybean lines with previously uncharacterized tolerance or non-toleranceto protoporphyrinogen oxidase inhibitors. The present analysis examinedone marker locus at a time and determined if the allele distributionwithin the tolerant group is significantly different from the alleledistribution within the non-tolerant group. A statistically differentallele distribution is an indication that the marker is linked to alocus that is associated with tolerance or non-tolerance toprotoporphyrinogen oxidase inhibitors. In this analysis, unadjustedprobabilities less than one are considered significant (the marker andthe phenotype show linkage disequilibrium), and adjusted probabilitiesless than approximately 0.05 are considered highly significant. Alleleclasses represented by less than 5 observations across both groups werenot included in the statistical analysis. In this analysis, 1043 markerloci had enough observations for analysis.

This analysis compares the plants' phenotypic score with the genotypesat the various loci. This type of intergroup analysis neither generatesnor requires any map data. Subsequently, map data (for example, acomposite soybean genetic map) is relevant in that multiple significantmarkers that are also genetically linked can be considered ascollaborating evidence that a given chromosomal region is associatedwith the trait of interest.

Results:

Table 9 lists the soybean markers that demonstrated linkagedisequilibrium with the tolerance to protoporphyrinogen oxidaseinhibitor phenotype. There were 1043 markers used in this analysis. Alsoindicated in that table are the chromosomes on which the markers arelocated and their approximate map position relative to other knownmarkers, given in cM, with position zero being the first (most distal)marker known at the beginning of the chromosome. These map positions arenot absolute, and represent an estimate of map position. The statisticalprobabilities that the marker allele and tolerance phenotype aresegregating independently are reflected in the Adjusted Probabilityvalues. Out of 584 loci studied in 38 sensitive and 160 tolerant soybeanlines, QTLs on Lg-L were highly significant, as shown in the tablebelow.

TABLE 9 Intergroup analysis results for Lg-L markers Linkage G- LocusTest Group Position value df Prob(G) Adj Prob S00224-1 GW L 12.03 89.87−1 0 0 P10649C- ASH L 3.6 86.01 −1 0 0 3 SATT523 SSR L 32.4 24.02 −10.000001 0.000592Table 10 shows the allele distribution between 101 tolerant lines and32/33 non-tolerant lines analyzed. Lines exhibiting tolerance areindicated in the first column as “TOL,” and lines exhibitingnon-tolerance are indicated in the first column as “NON.” Marker callsfor the P10649C-3 locus and the S60167-TB locus were available for 132and 63 of the lines respectively.

TABLE 10 Allele distribution P10649C-3 allele Phenotype LG-L TOL 1 TOL 1TOL 1 TOL 1 TOL 1 TOL 1 TOL 1 TOL 1 TOL 1 TOL 1 TOL 1 TOL 1 TOL 1 TOL 1TOL 1 TOL 1 TOL 1 TOL 1 TOL 1 TOL 1 TOL 1 TOL 1 TOL 1 TOL 1 TOL 1 TOL 1TOL 1 TOL 1 TOL 1 TOL 1 TOL 1 TOL 1 TOL 1 TOL 1 TOL 1 TOL 1 TOL 1 TOL 1TOL 1 TOL 1 TOL 1 TOL 1 TOL 1 TOL 1 TOL 1 TOL 1 TOL 1 TOL 1 TOL 1 TOL 1TOL 1 TOL 1 TOL 1 TOL 1 TOL 1 TOL 1 TOL 1 TOL 1 TOL 1 TOL 1 TOL 1 TOL 1TOL 1 TOL 1 TOL 1 TOL 1 TOL 1 TOL 1 TOL 1 TOL 1 TOL 1 TOL 1 TOL 1 TOL 1TOL 1 TOL 1 TOL 1 TOL 1 TOL 1 TOL 1 TOL 1 TOL 1 TOL 1 TOL 1 TOL 1 TOL 1TOL 1 TOL 1 TOL 1 TOL 1 TOL 1 TOL 1 TOL 1 TOL 1 TOL TOL 1 TOL 1 TOL 2TOL 1 TOL 1 TOL 1 NON 3 NON 3 NON 1 NON 1_2 NON 3 NON 3 NON 1 NON 3 NON2 NON 3 NON 2 NON 2 NON 2 NON 1 NON 2_3 NON 3 NON 3 NON 2_3 NON 3 NON 3NON 1 NON 2 NON 3 NON 3 NON 3 NON 2 NON 3 NON 1_3 NON 3 NON 2 NON 1 NON3

The non-random distribution of alleles between the tolerant andnon-tolerant plant groups at the marker loci in Table 10 is goodevidence that a QTL influencing tolerance to protoporphyrinogen oxidaseinhibitors is linked to these marker loci.

Example 4: Predication and Confirmation of Marker Based Selection forResponse to PPO Chemistries in a Set of Diverse Public Soybean Lines

Marker haplotype data for a set of 17 diverse public soybean lines wasdetermined for two QTL identified in Example 3 for Linkage Group Lmolecular markers P10649C-3 (approximate position 3.6) and S00224-1(approximate position 12.0). The response of these lines tosulfentrazone herbicide was published by Hulting et al. (Soybean(Glycine max (L.) Merr.) cultivar tolerance to sulfentrazone. 2001Science Direct, Vol. 20(8): 679-683). The phenotypic response wasreported as a growth reduction index: plant height and visual injury asexpressed as a percentage of check plot of each cultivar. Data for themarker haplotype on Linkage Group L and the herbicide bioassay resultsare presented in Table 11. Use of the molecular diagnostic P10649C-3(linked QTL on Linkage Group L, approximate position 3.6) for this setof phentoyped soybean lines is 92% predictive of tolerance tosulfentrazone when injury is set at 39% or less GRI and is 100%predictive of non-tolerance to sulfentrazone when injury is set at 40%or higher GRI. Use of the S00224-1 marker (approximate position 12.0)for this set of soybean lines is 88% predictive of tolerance tosulfentrazone when injury is set at 39% or less GRI and is 100%predictive of non-tolerance to sulfentrazone when injury is set at 40%or more GRI.

TABLE 11 Marker haplotype at/near QTL on Linkage Group L for PPOherbicide (sulfentrazone) response and phenotypic measure of cropresponse, expressed in terms of Growth Reduction Index, for soybeancultivars (italicized items indicate deviations from expected) LinkageGroup L Growth QTLs Reduction Position 3.6 Position 12.0 Cultivar Index*P10649C-3 S00224-1 PI88788 2 1, 1 3, 3 Richland 4 1, 1 3, 3 Lincoln 5 1,1 3, 3 PI180501 8 1, 1 3, 3 Illini 8 1, 1 3, 3 S100 8 1, 1 3, 3 Mukden 81, 1 3, 3 Arksoy 10 1, 1 3, 3 Capital 10 1, 1 3, 3 Haberlandt 10 3, 3 2,2 Ralsoy 13 1, 1 2, 3 Dunfield 16 1, 1 3, 3 Peking 22 1, 1 3, 3 Roanoke40 3, 3 2, 2 Ogden 42 3, 3 2, 2 Hutcheson 46 3, 3 2, 2 Ransom 52 3, 3 2,2 allele call load percent accuracy correct tolerant (alleles 1) 24/26 =(allele 3) 23/26 = 92% 88% correct (allele 3) 8/8 = 100% (allele 2) =8/8 = non-tolerant 100% *growth reduction index (plant height and visualinjury as expressed as a percentage of check plot of each cultivar);Pre-emergence sulfentrazone application of 0.28 kg ai/ha, from Hulting,et al. (supra)

Example 5: Predication and Confirmation of Marker Based Selection forResponse to PPO Chemistries in a Set of Soybean Commercial Lines

Haplotype data for a set of 7 commercial soybean lines was determinedfor two QTL identified in the previous example for Linkage Group Lmolecular markers P10649C-3 (position 3.6) and S00224-1 (position 12.0).The response of these lines to sulfentrazone herbicide was determined bymethod used in Example 3. In addition, the same scale was used forscoring such that:

-   -   9=Equivalent or better when compared to the tolerant check    -   7=Very little damage or response noted.    -   5=Intermediate response or damage    -   3=Major damage, including stunting and foliar necrosis    -   1=Severe damage, including severe stunting and necrosis;        equivalent or worse when compared to the non-tolerant check        Data for the marker haplotype on Linkage Group L and the        herbicide bioassay results are presented in Table 12. Use of        either/both of these markers for this set of phentoyped soybean        lines is 100% predictive of both tolerance (score of a 7 or 9)        and non-tolerance (score of a 1 for the non-tolerant check).

TABLE 12 Prediction and confirmation of marker based selection at QTLfor linkage group L for response to PPO chemistry (sulfentrazone) in aset of commercial soybean varieties. Position 3.6 Position 12.0 Varietysulfentrazone injury score P10649C-3 S00224-1 93B41 9 1, 1 3, 3 93B82 91, 1 3, 3 9281 9 1, 1 3, 3 9584 9 1, 1 3, 3 92B52 7 1, 1 3, 3 92B61 7 1,1 3, 3 9692 1 3, 3 2, 2

Example 6: Predication and Confirmation of Marker Based Selection forResponse to PPO Chemistries (Sulfentrazone) in Ten Lines from a Set ofSoybean Lines Phenotyped at the University of Illinois

A comparison for the marker predictiveness of PPO response wasconducted. The herbicide bioassay experiment used is described inPhytoxic Response and Yield of Soybean (Glycine max) Varieties Treatedwith Sulfentrazone or Flumioxazin (Taylor-Lovell et al., 2001 WeedTechnology 15:96-102). Phenotypic data was taken from Table 2 of thepublication for those varieties for which in-house marker data wasavailable. Phenotypic score and haplotype data for a set of 10 soybeanlines (1 public and 9 commercial) in the chromosomal regions around theQTL for Linkage group L is presented in Table 13. The phenotypic scorewas determined as percent injury which is defined as visible injuryratings including stunting, chlorosis, and bronzing symptomology (0=noinjury; 100=complete death) with 448 g ai/ha field application. Ratingswere taken 12 days after treatment. Use of marker P10649C (linked QTL onLinkage Group L, approximate position 3.6, allele call 1) for this setof phentoyped soybean lines is 100% predictive of tolerance (allelecall 1) to sulfentrazone when injury is 21% or less and is 100%predictive of non-tolerance (allele call 2 or 3) to sulfentrazone wheninjury is 43% or greater. The predictiveness of marker S00224-1 is also100% accurate for tolerance (allele 3) and non-tolerance (allele 2) forthis set of material.

TABLE 13 Marker haplotype at/near QTL on Linkage Group L for PPOherbicide (sulfentrazone) response and phenotypic measure of crop injurysulfentrazone injury Position 3.6 Position 12.0 Variety score P10649C-3S00224-1 P9584 5 1, 1 3, 3 P9671 5 1, 1 3, 3 P9151 8 1, 1 3, 3 P9306 151, 1 3, 3 Elgin 18 1, 1 3, 3 P9282 19 1, 1 3, 3 P9352 21 1, 1 3, 3 P936243 2, 2 2, 2 91B01 58 3, 3 2, 2 P9552 61 3, 3 2, 2 LSD (0.05) 8 allelecall load percent accuracy correct tolerant (alleles 1 or 2) 14/14 =(allele 3) 14/14 = 100% 100% correct (allele 3) 8/8 = 100% (allele 2) =8/8 = non-tolerant 100%

Example 7: Fine Mapping of the LG-L Herbicide Tolerance QTL

The herbicide tolerance QTL on LG-L was initially mapped in twodifferent soybean mapping populations: GEID1653063×GEID3495695(F4-derived F6) and GEID4520632×GEID7589905 (F3-derived F5). From thesepopulations, 184 and 180 lines respectively were genotyped and scoredfor PPO herbicide tolerance as described above. This data was used tomap the herbicide tolerance QTL to chromosome GM19 near the closelylinked marker S03859-1-A, which explains 80% of the phenotypicvariation. From these two populations, lines with recombinationbreakpoints near S03859-1-A were identified to define the borders of theQTL and to facilitate fine-mapping.

Subsequent analysis of the recombinants indicated that the closelylinked marker S03859-1-A was actually the left flanking marker. TheGEID1653063×GEID3495695 population had 37 recombinants that set theflanking markers for the herbicide tolerance QTL as S04867-1-A (GM19:841543-841958) and S03859-1-A (GM19: 1634882-1635399) (Table 17). TheGEID4520632×GEID7589905 population had 42 recombinants that delimit theQTL to the same interval (Table 18).

Because S03859-1-A was determined to be closely linked to the herbicidetolerance QTL, annotated loci in the vicinity of this marker weretargeted for SNP discovery and marker development. Primers were designedfrom target loci using Primer3 (open source software available fromSourceForge.net) and checked for uniqueness using bioinformaticssoftware. A panel composed of 20 PPO tolerant and 8 PPO susceptiblelines, including the four mapping parents from the mapping population,was re-sequenced at the target loci to identify informative SNPs. DNAwas extracted using the urea extraction protocol below and PCR amplifiedusing standard lab protocols (see Tables 14-15). The PCR was thencleaned up using the ExoSAP-IT® protocol (USB-Cleveland, Ohio, USA)(Table 15) before being sequenced by Sanger sequencing.

In total, 104 loci were re-sequenced and 235 informative SNPs wereidentified. From these SNPs, 22 Taqman® probe markers were designed todistinguish between tolerant versus susceptible alleles in the mappingpopulations. Taqman® assays were designed generally following ABIsuggested parameters. These markers were then run on 86 selectrecombinants combined from the two mapping populations to facilitatefine-mapping and to further delimit the herbicide tolerance QTL interval(Table 19).

Urea Extraction Protocol

1. Grind 2 g fresh tissue or .5 g lyophilized tissue and add it to 6 mLUrea Extraction Buffer and mix well. 2. Add RNase A (100 mg/mL) andincubate @ 37° C. for 20 min. a.   3 uL - Leaf b.   12 uL - Seed 3. Add4-5 mL Phenol:Chloroform:Isoamyl 25:24:1. Mix well. (Sigma P3803) 4. Puton rocker inside hood. a.   Fresh - 15 min b.   Lyophilized - 30 min 5.Centrifuge @ 8000 rpm at 10° C. for 10 min. 6. Transfer supernatant toclean tube. 7. Add 700 uL of 3M NaOAC (pH 5.0) and 5 mL coldisopropanol. Mix well. 8. Hook DNA and wash in 70% EtOH. 9. Repeat 70%wash. 10. Transfer pellet to 1.5 mL tube and allow to dry. 11. Dissolvepellet in 1 mL 10 mM Tris. 7M Urea Extraction Buffer Water 350 mL Urea336 g 5M NaCl 50 mL (14.61 g) 1M Tris 40 mL (pH 8.0) .5M EDTA 32 mL (pH8.0) 20% Sarcosine Sol.  40 mL (8 g) Adjust volume to 800 mL with ddH2O

TABLE 14 PCR Reaction Mix for SNP Discovery 1X (uL) 24 plate (ul) 36plate (uL) 48 plate (uL) gDNA (~50-100 ng) 2.0 — — — 10x PCR Buffer 2.05,952 7,680 10,944 1 mM dNTP 2.0 5,952 7,680 10,944 Taq 0.1 297.6 384547.2 0.5 uM Primer 4.0 — — — (F + R) ddH2O 9.9 29,462 38,016 54,173Total 20.0 41,664 53,760 76,608

TABLE 15 PCR Setup for SNP Discovery Dipper Setup PCR conditions TempTime #Cycles initial denature 94 C.  3 min 1X denature 94 C. 45 sec 35X anneal 65 C. 60 sec extension 72 C. 75 sec final extension 72 C.  5 min1X end

TABLE 16 Protocol for PCR clean up PCR clean up Exo/SAP Mix(pre-sequencing) add 3.6 ul of mastermix to 7 μl final PCR product 24plate (μl) 36 plate (μl) 48 plate (μl) ddH2O 4,285.4 5,944.3 7,326.7 SAP4,285.4 5,944.3 7,326.7 Exo 2,142.7 2,972.2 3,663.4 total 10,714 14,86118,317

TABLE 17 Initial recombinants identified from GEID1653063 × GEID3495695mapping population that delimited herbicide tolerance QTL to intervalbetween S04867-1-A and S03859-1-A S04867-1- SAMPLE A S03859-1-A CallAverage Comment Genetic Pos 7.81 10.00 GEID1653063 A A SUS 1 ControlGEID3495695 B B TOL 9 Control SJ22185567 A B TOL 9 L border SJ22185980 AB TOL 9 L border SJ22186045 A B TOL 9 L border SJ22186929 A B TOL 9 Lborder SJ22186019 B H TOL 9 R border SJ22185608 H B TOL 9 L borderSJ22186913 H B TOL 9 L border SJ22185928 H B TOL 9 L border SJ22186923 HB TOL 8.333333 L border SJ22185569 A H SEG 5 L border SJ22186052 A H SEG6.333333 L border SJ22186882 A H SEG 5 L border SJ22186919 B H SEG5.666667 L border SJ22186968 B H SEG 6.333333 L border SJ22186824 B HSEG 6.333333 L border SJ22185604 H B SEG 6.333333 R border SJ22185573 HA SEG? 3.666667 R border SJ22185983 A B SUS 1 R border SJ22186894 A BSUS 2.333333 R border SJ22185562 A H SUS 1.666667 R border SJ22185941 AH SUS 1 R border SJ22185534 B A SUS 3 L border SJ22185545 B A SUS1.666667 L border SJ22185559 B A SUS 2.333333 L border SJ22186023 B ASUS 3 L border SJ22186057 B A SUS 1 L border SJ22186065 B A SUS 1 Lborder SJ22186837 B A SUS 3 L border SJ22185957 B A SUS 1 L borderSJ22186846 B A SUS 1.666667 L border SJ22186840 H A SUS 1 L borderSJ22186950 H A SUS 1 L border SJ22186872 H A SUS 2.333333 L borderSJ22186836 H A SUS 1.666667 L border SJ22186074 H A SUS 1 L borderSJ22186906 H A SUS 1 L border SJ22185984 H A SUS 1 L border

TABLE 18 Initial recombinants identified from GEID4520632 × GEID7589905mapping population that delimited herbicide tolerance QTL to intervalbetween S04867-1-A and S03859-1-A S04867-1- SAMPLE A S03859-1-A CallAverage Comment Genetic Pos 7.81 10.00 GEID7589905 A A SUS 1 ControlGEID4520632 B B TOL 9 Control SP21669231 A B TOL 9 L border SP21669401 AB TOL 9 L border SP21669240 A B TOL 9 L border SP21669613 A B TOL 9 Lborder SP21669249 H B TOL 9 L border SP21669645 H B TOL 9 L borderSP21669670 H B TOL 9 L border SP21669563 H B TOL 9 L border SP21669592 HB TOL 9 L border SP21669260 B A SUS 1 L border SP21669265 B A SUS 1 Lborder SP21669778 B A SUS 1.666667 L border SP21669590 B A SUS 1 Lborder SP21669751 A H SUS 1 R border SP21669380 H A SUS 2.666667 Lborder SP21669679 H A SUS 1 L border SP21669708 H A SUS 1 L borderSP21669755 H A SUS 1 L border SP21669214 H A SUS 1 L border SP21669573 HA SUS 1.666667 L border SP21669612 H A SUS 2.333333 L border SP21669336H A SUS 3.666667 L border SP21669201 B H SEG 5 L border SP21669503 B HSEG 5 L border SP21669664 B H SEG 5 L border SP21669540 B H SEG 5 Lborder SP21669752 B H SEG 5.666667 L border SP21669230 B H SEG 5.666667L border SP21669331 A H SEG 6.333333 L border SP21669371 A H SEG 5 Lborder SP21669542 A H SEG 6.333333 L border SP21669584 A H SEG 5 Lborder SP21669694 A H SEG 5.666667 L border SP21669763 A H SEG 5 Lborder SP21669533 A H SEG 5 L border SP21669417 A H SEG 6.333333 Lborder SP21669647 A H SEG? 7.666667 L border SP21669651 A H SEG?7.666667 L border SP21669541 H B SEG? 7.666667 R border SP21669749 H ASEG 5 R border SP21669356 H A SEG 5 R border SP21669674 H A SEG?3.666667 R border

In an initial analysis of the GEID1653063×GEID3495695 mappingpopulation, four key recombinants were identified which served tofurther fine-map the herbicide tolerance QTL interval (Table 20). Arecombination breakpoint at S08110-1-Q1 in line 5J22186052 set the leftborder, while breakpoints at S08105-1-Q1 in SJ22186019, SJ22186894, andSJ22185941 set the right border. These recombinants delimit theherbicide tolerance QTL to an ˜70 kb interval. Initial analysis of theGEID4520632×GEID7589905 mapping population identified eight keyrecombinants (Table 13). A recombination breakpoint in line SP21669503at S08117-1-Q1 set the left border, while breakpoints in SP21669249,SP21669332, SP21669615, SP21669616, SP21669670, SP21669458, andSP21669760 set the right border at S08010-1-Q1. These recombinantsdelimit the herbicide tolerance QTL to a ˜526 kb interval. However, whenthe data from these two mapping populations are combined into a singleset, the herbicide tolerance QTL interval was delimited to a ˜56 kbinterval between S08117-1-Q1 and S08105-1-Q1 (Table 19 and Table 20).

To facilitate higher resolution mapping of the herbicide tolerance QTLinterval, lines from the initial set of 86 recombinants were re-scoredfor herbicide tolerance to confirm their phenotype. Moreover, newmarkers were developed and used to genotype these recombinants.Consequently, this further analysis resulted in the identification of akey recombinant (SP21669417) from the GEID4520632×GEID7589905 mappingpopulation which set the left border of the herbicide tolerance QTLinterval at S08113-1-Q1 (Table 13). In summary, key recombinants fromthe two mapping populations, scored in two fine-mapping experiments,define the herbicide tolerance QTL to a ˜44 kb interval betweenS08113-1-Q1 and S08105-1-Q1 (Table 19 and Table 20).

TABLE 19 Summary of SNP markers used for initial QTL mapping andfine-mapping of herbicide tolerance QTL. Combined data from the twopopulations delimits the QTL to a ~44 kb interval between S08113-1-Q1and S8105-1-Q1 First Base Last base Marker Amplicon Loci Coordinatecoordinate Population Fine-mapping Comment S04867-1-A Glyma19g01220.1841543 841958 Both S08102-1-Q1 PPO_Gm19_1487k3-1 Glyma19g01860.1 14891131489545 Both S08103-1-Q1 PPO_Gm19_1491k1-1 X 1491603 1492136 BothS08104-1-Q1 PPO_Gm19_1491k2-1 Glyma19g01870.1 1492364 1492948 BothS08106-1-Q1 PPO_Gm19_1499k2-1 Glyma19g01880.1 1500732 1501392 AS08107-1-Q1 PPO_Gm19_1541k3-1 Glyma19g01900.1 1542880 1543693 AS08109-1-Q1 PPO_Gm19_1541k4-1 Glyma19g01900.1 1543868 1544588 AS08110-1-Q1 PPO_Gm19_1548k1-1 Glyma19g01910.1 1548367 1548822 A L borderPop A S08111-1-Q1 PPO_Gm19_1548k2-1 Glyma19g01910.1 1548902 1549558 AS08115-2-Q1 PPO_Gm19_1563k1-1 X 1563958 1564512 Both S08117-1-Q1PPO_Gm19_1563k2-1 X 1564563 1564960 Both L border Pop B S08119-1-Q1PPO_Gm19_1566k2-1 Glyma19g01920.1 1567791 1568282 Both histonedeacetylase S08118-1-Q1 PPO_Gm19_1566k4-1 Glyma19g01920.1 15692731569748 Both histone deacetylase S08116-1-Q1 PPO_Gm19_1566k5-1Glyma19g01920.1 1570198 1570729 Both histone deacetylase S08101-1-Q1PPO_Gm19_1586k1-1 Glyma19g01940.1 1587051 1587687 Both multidrug/pheromone exporter, ABC superfamily S08112-1-Q1 PPO_Gm19_1586k1-1Glyma19g01940.1 1587051 1587687 Both multidrug/ pheromone exporter, ABCsuperfamily S08108-1-Q1 PPO_Gm19_1586k2-1 Glyma19g01940.1 15878051588500 Both multidrug/ pheromone exporter, ABC superfamily S08101-1-Q1PPO_Gm19_1586k4-1 Glyma19g01940.1 1589409 1590062 Both multidrug/pheromone exporter, ABC superfamily S08101-2-Q1 PPO_Gm19_1586k4-1Glyma19g01940.1 1589409 1590062 Both multidrug/ pheromone exporter, ABCsuperfamily S08101-3-Q1 PPO_Gm19_1586k4-1 Glyma19g01940.1 15894091590062 Both multidrug/ pheromone exporter, ABC superfamily S08101-4-Q1PPO_Gm19_1586k4-1 Glyma19g01940.1 1589409 1590062 Both multidrug/pheromone exporter, ABC superfamily S08105-1-Q1 PPO_Gm19_1618k2-1 X1619657 1620279 Both R border Pop A S03859-1-A sbacm.pk005.c3.f X1634882 1635399 Both S08010-1-Q1 PPO_Gm19_2089k4-1 Glyma19g02370.12091644 2092359 Both R border Pop B S08010-2-Q2 PPO_Gm19_2089k4-1Glyma19g02370.1 2091644 2092359 Both *Population A =GEID1653063/GEID3495695; Population B = GEID4520632/GEID7589905Tables 20A-20H. Fine-Mapping of the Herbicide Tolerance QTL Intervalwith Recombinants from the GEID1653063×GEID3495695 Population. KeyRecombinants Delimit the QTL to the ˜70 kb Interval Between S08110-1-Q1and S08105-1-Q1.

TABLE 20A Marker S04867-1-A S08102-1-Q1 S08103-1-Q1 S08104-1-Q1Amplicon/Pos Gm19:841750 PPO_Gm19_1487k3-1 PPO_Gm19_1491k1-1PPO_Gm19_1491k2-1 Sample SJ22185925 B B B B SJ22186974 B B B BSJ22185946 B B B B SJ22186019 B B B B SJ22186923 H H H H SJ22185604 H HH H SJ22186029 H H H H SJ22186052 A A A A SJ22185534 B A A A SJ22185552A A A A SJ22186842 A A — A SJ22186924 A A A A SJ22186873 A A A ASJ22186894 A A A A SJ22185957 B A A A SJ22185941 A A A A SJ22186872 H AA A SJ22185984 H H H H SJ22186045 — — H H SJ22186913 — — H H SJ22186891— — H H SJ22186879 — — H H SJ22186841 — — H H SJ22186057 — — H HSJ22186065 — — H H SJ22186951 — — H H SJ22186840 — — H H SJ22186070 — —A A

TABLE 20B Marker S08106-1-Q1 S08107-1-Q1 S08109-1-Q1 S08110-1-Q1Amplicon/Pos PPO_Gm19_1499k2-1 PPO_Gm19_1541k3-1 PPO_Gm19_1541k4-1PPO_Gm19_1548k1-1 Sample SJ22185925 B2 B B B SJ22186974 B1 B B BSJ22185946 B2 B B B SJ22186019 B2 B B B SJ22186923 H B — B SJ22185604 HH H H SJ22186029 H H H H SJ22186052 A A A A SJ22185534 A A A ASJ22185552 A A A A SJ22186842 A A A A SJ22186924 A A A A SJ22186873 A AA A SJ22186894 H A A A SJ22185957 A A A A SJ22185941 A A A A SJ22186872A A A A SJ22185984 H A A A SJ22186045 H — — H SJ22186913 H — — BSJ22186891 H — — H SJ22186879 H — — H SJ22186841 H — — H SJ22186057 H —— H SJ22186065 H — — H SJ22186951 H — — H SJ22186840 H — — A SJ22186070A — — A

TABLE 20C Marker S08111-1-Q1 S08115-2-Q1 S08117-1-Q1 S08119-1-Q1Amplicon/Pos PPO_Gm19_1548k2-1 PPO_Gm19_1563k1-1 PPO_Gm19_1563k2-1PPO_Gm19_1566k2-1 Sample SJ22185925 B B B B SJ22186974 B B/H B BSJ22185946 B B B B SJ22186019 B B B B SJ22186923 B B B B SJ22185604 H HH H SJ22186029 H H H H SJ22186052 — H H H SJ22185534 A A A A SJ22185552A A A A SJ22186842 A A A A SJ22186924 A A A A SJ22186873 A A A ASJ22186894 A A A A SJ22185957 A A A — SJ22185941 A A A A SJ22186872 A AA — SJ22185984 A A A A SJ22186045 H B B B SJ22186913 B B B B SJ22186891H H H H SJ22186879 H H H H SJ22186841 H H H H SJ22186057 H H H HSJ22186065 H H H H SJ22186951 H H H H SJ22186840 A A A A SJ22186070 A AA A

TABLE 20D Marker S08118-1-Q1 S08116-1-Q1 S08114-1-Q1 S08113-1-Q1Amplicon/Pos PPO_Gm19_1566k4-1 PPO_Gm19_1566k5-1 PPO_Gm19_1571k3-1PPO_Gm19_1571k3-1 Sample SJ22185925 B B — — SJ22186974 — B — —SJ22185946 B B — — SJ22186019 — B B B SJ22186923 B B B B SJ22185604 H H— — SJ22186029 H H — — SJ22186052 — H — — SJ22185534 A A — — SJ22185552A A — — SJ22186842 A A — — SJ22186924 A A — — SJ22186873 A A — —SJ22186894 A A A A SJ22185957 A A A A SJ22185941 A A A A SJ22186872 A A— — SJ22185984 A A A A SJ22186045 B B B B SJ22186913 B B B B SJ22186891H H H H SJ22186879 H H H H SJ22186841 H H — — SJ22186057 H H H HSJ22186065 H H H H SJ22186951 H H H H SJ22186840 A A A A SJ22186070 A AA A

TABLE 20E Marker S08101-1-Q1 S08112-1-Q1 S08108-1-Q1 S08101-2-Q1Amplicon/Pos PPO_Gm19_1586k1-1 PPO_Gm19_1586k1-1 PPO_Gm19_1586k2-1PPO_Gm19_1586k4-1 Sample SJ22185925 B B B B SJ22186974 B B B BSJ22185946 B B B B SJ22186019 B B B B SJ22186923 B B B B SJ22185604 H HH H SJ22186029 H H H H SJ22186052 H H H H SJ22185534 A A A A SJ22185552A A A A SJ22186842 A A A A SJ22186924 A A A A SJ22186873 A A A ASJ22186894 A A A A SJ22185957 A A A A SJ22185941 A A A A SJ22186872 A AA A SJ22185984 A A A A SJ22186045 — B B B SJ22186913 — B B B SJ22186891— H H H SJ22186879 — H H H SJ22186841 — H H H SJ22186057 — H H HSJ22186065 — H H H SJ22186951 — H H H SJ22186840 — A A A SJ22186070 — AA A

TABLE 20F Marker S08101-1-Q1 S08101-2-Q1 S08101-3-Q1 S08101-4-Q1Amplicon/Pos PPO_Gm19_1586k4-1 PPO_Gm19_1586k4-1 PPO_Gm19_1586k4-1PPO_Gm19_1586k4-1 Sample SJ22185925 B — B B SJ22186974 B — B BSJ22185946 B — B B SJ22186019 B B B B SJ22186923 B B B B SJ22185604 H —H H SJ22186029 H — H H SJ22186052 H — H H SJ22185534 A — A A SJ22185552A — A A SJ22186842 A — A A SJ22186924 A — A A SJ22186873 A — A ASJ22186894 A A A A SJ22185957 A A A A SJ22185941 A A A A SJ22186872 A —A A SJ22185984 A A A A SJ22186045 — B B B SJ22186913 — B B B SJ22186891— H H H SJ22186879 — H H H SJ22186841 — H H H SJ22186057 — H H HSJ22186065 — H H H SJ22186951 — H H H SJ22186840 — A A A SJ22186070 — AA A

TABLE 20G Marker S08105-1-Q1 S08007-1-Q1 S03859-1-A S08010-1-Q1Amplicon/Pos PPO_Gm19_1618k2-1 PPO_Gm19_2089k3-1 PPO_Gm19_1635140PPO_Gm19_2089k4-1 Sample SJ22185925 B — B A SJ22186974 B — B ASJ22185946 B — B A SJ22186019 H H H H SJ22186923 B B B B SJ22185604 B —B B SJ22186029 H — H B SJ22186052 H — H H SJ22185534 A — A B SJ22185552A — A B SJ22186842 A — A B SJ22186924 A — A B SJ22186873 A — A BSJ22186894 B B B B SJ22185957 A B A B SJ22185941 H H H H SJ22186872 A —A B SJ22185984 A A A A SJ22186045 B B — B SJ22186913 B B — B SJ22186891H A — A SJ22186879 H B — B SJ22186841 H A — A SJ22186057 H A — ASJ22186065 H H — A SJ22186951 H H — A SJ22186840 A A — A SJ22186070 A H— H

TABLE 20H Marker S08010-2-Q2 Amplicon/Pos PPO_Gm19_2089k4-1 CommentPhenotype SJ22185925 A TOL SJ22186974 A TOL SJ22185946 H TOL SJ22186019H R Border TOL SJ22186923 B TOL SJ22185604 B SEG SJ22186029 B SEGSJ22186052 H L Border SEG SJ22185534 B SUS SJ22185552 B SUS SJ22186842 BSUS SJ22186924 B SUS SJ22186873 B SUS SJ22186894 B R Border SUSSJ22185957 B SUS SJ22185941 H R Border SUS SJ22186872 B SUS SJ22185984 ASUS SJ22186045 B TOL SJ22186913 B TOL SJ22186891 A SEG SJ22186879 B SEGSJ22186841 A SEG SJ22186057 A SEG SJ22186065 A SEG SJ22186951 A SEGSJ22186840 A SUS SJ22186070 H SUSTables 20I-20L. Fine-Mapping of the Herbicide Tolerance QTL Intervalwith Recombinants from the GEID4520632×GEID7589905 Population

TABLE 20I Marker S08102-1- S08103-1- S08104-1- S08115-2- S08115-1-S08117-1- Sample Comment Phenotype S04867-1-A Q1 Q1 Q1 Q1 Q1 Q1SP21669249 R Border TOL H B B B B — B SP21669332 R Border TOL B B — B B— B SP21669615 R Border TOL B — B B B — B SP21669616 R Border TOL B B —B B/H — B SP21669670 R Border TOL H B B B — — B SP21669503 L Border SEGB B B B B — B SP21669458 R Border SUS A A A A A — A SP21669760 R BorderSUS A A A A A — A SP21669417 L Border SEG — — A A — A A SP21669560 SEG —— B B — H H SP21669331 SEG — — H H — H H

TABLE 20J Marker S08119-1- S08118-1- S08116-1- S08114-1- S08113-1-S08101-1- S08112-1- Sample Comment Phenotype Q1 Q1 Q1 Q1 Q1 Q1 Q1SP21669249 R Border TOL B B B — — B B SP21669332 R Border TOL B B B — —B B SP21669615 R Border TOL B B B — — B B SP21669616 R Border TOL B B B— — B B/H SP21669670 R Border TOL B B B — — B B SP21669503 L Border SEGH H H — — H H SP21669458 R Border SUS A A A — — A A SP21669760 R BorderSUS A A A — — A A SP21669417 L Border SEG A A A A A — H SP21669560 SEG —H H H H — H SP21669331 SEG H H H H H — H

TABLE 20K Marker S08108-1- S08101-1- S08101-2- S08101-3- S08101-4-S08105-1- Sample Comment Phenotype Q1 Q1 Q1 Q1 Q1 Q1 S03859-1-ASP21669249 R Border TOL B B B B B B B SP21669332 R Border TOL B B B B —B B SP21669615 R Border TOL B B B B B B B SP21669616 R Border TOL B B BB B B B SP21669670 R Border TOL B B B B B B B SP21669503 L Border SEG HH H H H H H SP21669458 R Border SUS A A A A A A A SP21669760 R BorderSUS A A A A A A A SP21669417 L Border SEG H — H H H H — SP21669560 SEG H— H H H H — SP21669331 SEG H — H H H H —

TABLE 20L Marker Sample Comment Phenotype S08007-1-Q1 S08010-1-Q1S08010-2-Q2 SP21669249 R Border TOL — H H SP21669332 R Border TOL — H HSP21669615 R Border TOL — B B SP21669616 R Border TOL — H H SP21669670 RBorder TOL — B B SP21669503 L Border SEG — H H SP21669458 R Border SUS —H H SP21669760 R Border SUS — H H SP21669417 L Border SEG H H HSP21669560 SEG H — H SP21669331 SEG A A A

Example 8: SNP Haplotype Association Analysis

Association analysis of SNP haplotypes across the herbicide toleranceQTL region provides an independent method of validating the herbicidetolerance interval. From the panel of susceptible and tolerant linesused to identify SNPs for Taqman® probe development, 235 SNPs from 49amplicons were identified in the vicinity of the closely linked markerS03859-1-A. The resulting SNP haplotype data was analyzed to identify aninterval in which all of the haplotypes from the susceptible andtolerant lines co-segregated with each other (Table 21).

TABLE 21 SNP haplotype association analysis of the herbicide toleranceQTL interval. Perfect association between haplotype and phenotypebetween amplicons 1563k1 and 1618k2 defines the QTL interval GEIDAmplicon 1563k1 1563k1 1563k1 1563k1 1618k2 1618k2 627002 TOL (PPO) G GA C * C 3911338 TOL (PPO) G G A C * C 1564727 TOL (PPO) G G A C * C4230314 TOL (PPO) G G A C * C 4135359 TOL (PPO) G G A C * C 4611588 TOL(PPO) G G A C * C 1590166 TOL (PPO) G G A C * C 3395451 TOL (PPO) G G AC * C 2322432 TOL (PPO) G G A C * C 4520632 TOL (PPO) G G A C * C 632343TOL (PPO) G G A C * C 1770139 TOL (PPO) G G A C * C 3587853 TOL (PPO) GG A C * C 4553991 TOL (PPO) G G A C * C 5183219 TOL (PPO) G G A C * C2636517 TOL (PPO) G G A C * C 3495695 TOL (PPO) G G A C * C 1737165 SUS(PPO) A * G T A A 1653063 SUS (PPO) A A 4501774 SUS (PPO) A * G T A A7589905 SUS (PPO) A * G T N A 4832982 SUS (PPO) A * G T N A 2839548 SUS(PPO) A * G T 3958440 SUS (PPO) A * G T A A 6116656 SUS (PPO) A * G T AA

Although it is difficult to definitively define the co-segregatingregion, it can conservatively be estimated to reside between ampliconsPPO_Gm19_1563k1 and PPO_Gm19_1618k2-1. Within the borders defined bythese loci, there are 38 SNP differences that are shared between all ofthe susceptible lines as compared to all the tolerant lines. Thisinterval overlaps with the ˜44 kb QTL interval identified byfine-mapping.

Example 9: QTL Analysis

The F2 population derived from GEID1653063×GEID6461257 consisting of 251progeny and segregating for the herbicide tolerance trait was used formapping. The trait has been previously mapped to LG-L. The populationwas screened with a total of 15 polymorphic markers from LG-L (Ch 19).Five of these 19 markers showed severe segregation distortion and wereexcluded in the mapping analysis. A significant QTL for herbicidetolerance was detected on the LG-L (LRS=364) which was closely linkedwith the PPO production marker S08101-2-Q1 and flanked by markersS04867-1-A (7.81 cM) and S03859-1-A (10.00 cM). The QTL explained around76% of phenotypic variation.

Material and Methods

Population: An F2 mapping population GEID1653063/GEID6461257 consistingof 251 F2 progeny was used. DNA extraction of the tissue was preparedusing a citrate extraction protocol and quantified using the GW DNAquantification protocol.

Phenotype: The herbicide tolerance phenotypes were for each line wereevaluated using chi-square analysis to establish a goodness to fit tothe expected 1:2:1 genetic segregation ratio. The goodness of fit testindicated that the phenotypic data for the 251 progeny follows theexpected 1:2:1 genetic ratio (p-value=0.769).

Genotype: PolyM was used to identify polymorphic markers between the twoparents. A total of 15 polymorphic markers from LG-L were assayed.Allele nomenclature used were maternal alleles were assigned “A” andpaternal alleles “B”, and heterozygous “H”. The 10 of 15 markers werelinked together on LG-L with 5 markers showing severe segregationdistortion in the population. The 5 markers showing severe segregationdistortion were excluded for mapping analysis.

Linkage Analysis: Map Manager QTX.b20 (Manly et al. (2001) MammalianGenome 12:930-932) was used to construct the linkage map and perform theQTL analysis. A 1000 permutation test was used to establish thethreshold for statistical significance (LOD ratio statistic—LRS) todeclare a putative QTL.

Map Manager parameters were set to:

1) Linkage Evaluation: Intercross 2) Search Criteria: P=1e-5 3) MapFunction: Kosambi 4) Cross Type: Line Cross QTL Analysis

Permutation Test: The thresholds at, 0.01 and 0.05 level based on a 1000permutation test for herbicide tolerance trait are 7.0 and 17.3,respectively. The marker regression analysis showed that the QTLassociated with herbicide tolerance could locate on the LG-L. Intervalmapping showed a highly significant region on LG L (LRS=346). The QTLwas closely linked with marker S08101-2-Q1 and flanked by markersS04867-1-A (7.81 cM) and S03859-1-A (10.00 cM). This region wasestimated to explain ˜76% of the phenotypic variation.

It will be apparent to those of skill in the art that it is not intendedthat the invention be limited by such illustrative embodiments ormechanisms, and that modifications can be made without departing fromthe scope or spirit of the invention, as defined by the appended claims.It is intended that all such obvious modifications and variations beincluded within the scope of the present invention as defined in theappended claims. The claims are meant to cover the claimed componentsand steps in any sequence which is effective to meet the objectivesthere intended, unless the context specifically indicates to thecontrary.

All publications referred to herein are incorporated by reference hereinfor the purpose cited to the same extent as if each was specifically andindividually indicated to be incorporated by reference herein.

What is claimed is:
 1. A method for selectively screening soybean plants for tolerance to one or more herbicides selected from the group consisting of a mesotrione herbicide and an isoxazole herbicide, the method comprising: (a) planting soybean seeds or plants comprising one or more marker loci within a chromosome interval selected from the group consisting of: (i) the chromosomal interval flanked by and including markers S04867-1-A and S03859-1-A on linkage group L (ii) the chromosomal interval flanked by and including markers S08110-1-Q1 and S08010-1-Q1 on linkage group L; (iii) the chromosomal interval flanked by and including markers S08117-1-Q1 and S08010-1-Q1 on linkage group L; (iv) the chromosomal interval flanked by and including markers S08110-1-Q1 and S08105-1-Q1 on linkage group L; (v) the chromosomal interval flanked by and including markers S08117-1-Q1 and S08105-1-Q1 on linkage group L; and (vi) the chromosomal interval flanked by and including markers S08113-1-Q1 and S08105-1-Q1 on linkage group L; (b) treating the plants by applying a sufficient amount of the one or more herbicides to differentiate between susceptible and tolerant plants; and (c) scoring the treated plants for tolerance to the herbicide.
 2. The method of claim 1, wherein the one or more marker loci are selected from the group consisting of SATT723, Sat_408, A169_1, EV2_1, S1e3_4s, BLT010_2, BLT007_1, SATT232, S04867-1-A, S08102-1-Q1, S08103-1-Q1, S08104-1-Q1, S08106-1-Q1, S08107-1-Q1, S08109-1-Q1, S08110-1-Q1, S08111-1-Q1, S08115-2-Q1, S08117-1-Q1, S08119-1-Q1, S08116-1-Q1, S08112-1-Q1, S08108-1-Q1, S08101-4-Q1, S08101-1-Q1, S08101-2-Q1, S08101-3-Q1, S08118-1-Q1, S08114-1-Q1, S08113-1-Q1, S03859-1-A, Sat_301, SATT446, SATT232, S08105-1-Q1, S08010-1-Q1, S08010-2-Q1, R176_1, JUBC090, SATT238, Sat_071, BLT039_1, Bng071_1, A264_1, RGA_7, RGA7, SATT523, Sat_134, S00224-1, S01659-1, LbA, i8_2, A450_2, A106_1, Sat_405, SATT143, B124_2, A459_1, SATT398, SATT694, Sat_195, Sat_388, SATT652, SATT711, Sat_187, SATT418, SATT278, Sat_397, Sat_191, Sat_320, O109_1, A204_2, SATT497, G214_17, B164_1, G214_16, A023_1, SATT284, AW508247, SATT462, L050_7, E014_1, A071_5, B046_1, L1, and B162_2.
 3. The method of claim 1, wherein the screening occurs as part of further breeding to improve a soybean variety's tolerance to one or more mesotrione herbicides or one or more isoxazole herbicides, and wherein the further breeding comprises crosses with other lines, crosses with hybrids, backcrossing, selfcrossing, or combinations thereof. 